{"id":28957,"date":"2024-10-17T03:08:36","date_gmt":"2024-10-17T03:08:36","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/smacna-hvacsystemsductdesign-2006-04e\/"},"modified":"2024-10-24T14:07:34","modified_gmt":"2024-10-24T14:07:34","slug":"smacna-hvacsystemsductdesign-2006-04e","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/smacna\/smacna-hvacsystemsductdesign-2006-04e\/","title":{"rendered":"SMACNA HVACSystemsDuctDesign 2006 04E"},"content":{"rendered":"

Presents the basic methods and procedures required to design HVAC air distribution systems. Offers the HVAC system designer and installer detailed information on duct design, materials and construction methods. In addition to the basic engineering guidelines for the sizing of HVAC ductwork systems, the manual also provides related information on economics of duct systems, duct system layout, pressure losses, fan selection, duct leakage, acoustic considerations, and Testing, Adjusting and Balancing (TAB). Both U.S. and metric units are provided in all examples, calculations, and tables.<\/span><\/p>\n

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PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
5<\/td>\nFOREWORD <\/td>\n<\/tr>\n
6<\/td>\nSMACNA DUCT DESIGN COMMITTEE <\/td>\n<\/tr>\n
7<\/td>\nNOTICE TO USERS OF THIS PUBLICATION <\/td>\n<\/tr>\n
11<\/td>\nTABLE OF CONTENTS <\/td>\n<\/tr>\n
21<\/td>\nCHAPTER 1 INTRODUCTION
1.1 SCOPE
1.2 HOW TO USE THIS MANUAL
1.3 PURPOSE
1.4 HISTORY OF AIR DUCT SYSTEMS <\/td>\n<\/tr>\n
22<\/td>\n1.5 GENERAL REQUIREMENTS
1.6 HVAC SYSTEMS LIBRARY <\/td>\n<\/tr>\n
23<\/td>\n1.7 CODES AND ORDINANCES <\/td>\n<\/tr>\n
24<\/td>\nFIGURE 1-1 U.S.A. BUILDING CODES AND ORDINANCES <\/td>\n<\/tr>\n
25<\/td>\n1.8 HVAC DUCT SYSTEM TYPES <\/td>\n<\/tr>\n
26<\/td>\n1.9 SMOKE CONTROL SYSTEMS <\/td>\n<\/tr>\n
27<\/td>\n1.10 INDOOR AIR QUALITY <\/td>\n<\/tr>\n
28<\/td>\n1.11 VENTILATION RATES <\/td>\n<\/tr>\n
31<\/td>\nCHAPTER 2 ECONOMICS OF DUCT SYSTEMS
2.1 SCOPE
2.2 RESPONSIBILITIES <\/td>\n<\/tr>\n
32<\/td>\n2.3 INITIAL SYSTEM COSTS
Table 2-1 Annual Life Cycle Cost Factors <\/td>\n<\/tr>\n
33<\/td>\n2.4 ANNUAL OWNING COSTS
2.5 ANNUAL OPERATING COSTS
2.6 OPERATION COSTS
Table 2-2 Cost of Owning and Operating a Typical Commercial Building <\/td>\n<\/tr>\n
34<\/td>\nTable 2-3 Initial Cost Systems <\/td>\n<\/tr>\n
35<\/td>\n2.7 CONTROLLING COSTS
2.8 DUCT ASPECT RATIOS
2.9 PRESSURE CLASSIFICATION AND LEAKAGE
Table 2-4 Aspect Ratio Example <\/td>\n<\/tr>\n
36<\/td>\nFIGURE 2-1 RELATIVE COSTS OF DUCT SEGMENTS INSTALLED
FIGURE 2-2 RELATIVE INSTALLED COST VERSUS ASPECT RATIO <\/td>\n<\/tr>\n
37<\/td>\n2.10 COST OF FITTINGS
Table 2-5 Relative Duct System Costs (Fabrication and installation of same size duct)
FIGURE 2-3 RELATIVE OPERATING COST VERSUS ASPECT RATIO <\/td>\n<\/tr>\n
38<\/td>\nTable 2-6 Estimated Equipment Service Lives <\/td>\n<\/tr>\n
41<\/td>\nCHAPTER 3 ROOM AIR DISTRIBUTION
3.1 SCOPE
3.2 COMFORT
Table 3-1 Metabolic Rates of Typical Tasks <\/td>\n<\/tr>\n
43<\/td>\nFIGURE 3-1 CLOTHING INSULATION NECESSARY FOR VARIOUS LEVELS OF COMFORT AT A GIVEN TEMPERATURE DURING LIGHT, MAINLY SEDENTARY ACTIVITIES <\/td>\n<\/tr>\n
44<\/td>\nTable 3-2 Operative Temperatures for Thermal Acceptability of Sedentary or slightly Active persons ( 1.2 Mets) at 50 percent Relative Humiditya <\/td>\n<\/tr>\n
46<\/td>\nFIGURE 3-2 COMFORT ZONE <\/td>\n<\/tr>\n
47<\/td>\nFIGURE 3-3 RANGE OF AVERAGE AIR MOVEMENTS PERMITTED IN THE SUMMER AND EXTENDED SUMMER ZONES <\/td>\n<\/tr>\n
48<\/td>\nTable 3-3 Clo Units for Individual Items of Clothing = 0.82 ( Individual Items) <\/td>\n<\/tr>\n
49<\/td>\nFIGURE 3-4 OPTIMUM OPERATIVE TEMPERATURES FOR ACTIVE PEOPLE IN LOW AIR MOVEMENT ENVIRONMENTS <\/td>\n<\/tr>\n
50<\/td>\nTable 3-4 Characteristic Room Lengths for Diffusers <\/td>\n<\/tr>\n
51<\/td>\nFIGURE 3-5 PERCENTAGE OF OCCUPANTS OBJECTING TO DRAFTS IN AIR-CONDITIONED ROOMS (I-P)
FIGURE 3-6 PERCENTAGE OF OCCUPANTS OBJECTING TO DRAFTS IN AIR-CONDITIONED ROOMS (SI) <\/td>\n<\/tr>\n
52<\/td>\nTable 3-5 Air Diffusion Performance Index (ADPI) <\/td>\n<\/tr>\n
53<\/td>\n3.3 AIR DISTRIBUTION FUNDAMENTALS
FIGURE 3-7 SURFACE (COANDA) EFFECT <\/td>\n<\/tr>\n
55<\/td>\n3.4 OUTLET LOCATION <\/td>\n<\/tr>\n
56<\/td>\nFIGURE 3-8 OUTLET VELOCITY AND AIR DIRECTION DIAGRAMS FOR STACK HEADS WITH EXPANDING OUTLETS <\/td>\n<\/tr>\n
57<\/td>\nTable 3-6 Guide for Selection of Supply Outlets
FIGURE 3-9 AIR MOTION CHARACTERISTICS OF GROUP A OUTLETS <\/td>\n<\/tr>\n
58<\/td>\nFIGURE 3-10 AIR MOTION CHARACTERISTICS OF GROUP B OUTLETS <\/td>\n<\/tr>\n
59<\/td>\nFIGURE 3-11 AIR MOTION CHARACTERISTICS OF GROUP C OUTLETS
FIGURE 3-12 AIR MOTION CHARACTERISTICS OF GROUP D OUTLETS <\/td>\n<\/tr>\n
60<\/td>\n3.5 OUTLET CRITERIA
3.6 GRILLE AND REGISTER APPLICATIONS
3.7 SLOT DIFFUSER APPLICATIONS
FIGURE 3-13 AIR MOTION CHARACTERISTICS OF GROUP E OUTLETS <\/td>\n<\/tr>\n
61<\/td>\n3.8 CEILING DIFFUSER APPLICATIONS <\/td>\n<\/tr>\n
62<\/td>\nTable 3-7 Supply Air Outlet Types <\/td>\n<\/tr>\n
63<\/td>\n3.9 OUTLETS IN VARIABLE AIR VOLUME (VAV) SYSTEMS
3.10 INLET CRITERIA <\/td>\n<\/tr>\n
64<\/td>\nTable 3-8 Supply Air Outlet Performance <\/td>\n<\/tr>\n
65<\/td>\n3.11 EXHAUST OUTLETS
3.12 SPECIAL SITUATIONS
3.13 AIR DISTRIBUTION SUMMARY <\/td>\n<\/tr>\n
66<\/td>\n3.14 ROOM TERMINAL DEVICES
Table 3-9 Recommended Return Air Inlet Face Velocities
Table 3-10 Return and Exhaust Air Inlet Types <\/td>\n<\/tr>\n
67<\/td>\nTable 3-11 Accessory devices <\/td>\n<\/tr>\n
68<\/td>\n3.15 SUPPLY AIR GRILLE AND REGISTER TYPES
3.16 SUPPLY AIR CEILING DIFFUSER TYPES <\/td>\n<\/tr>\n
69<\/td>\n3.17 VAV AND THERMAL BOXES <\/td>\n<\/tr>\n
70<\/td>\n3.18 TERMINAL BOX VARIATIONS <\/td>\n<\/tr>\n
71<\/td>\n3.19 BASIC VAV SYSTEM DESIGN <\/td>\n<\/tr>\n
72<\/td>\n3.20 VAV COMPONENTS AND CONTROLS <\/td>\n<\/tr>\n
73<\/td>\n3.21 VAV SYSTEM ADVANTAGES
3.22 VAV SYSTEM DESIGN PRECAUTIONS <\/td>\n<\/tr>\n
75<\/td>\n3.23 VAV TERMINAL DEVICES <\/td>\n<\/tr>\n
79<\/td>\nCHAPTER 4 GENERAL APPROACH TO DUCT DESIGN
4.1 SCOPE <\/td>\n<\/tr>\n
81<\/td>\n4.2 DESIGN METHODS – OVERVIEW <\/td>\n<\/tr>\n
82<\/td>\n4.3 SELDOM USED METHODS <\/td>\n<\/tr>\n
83<\/td>\n4.4 DUCT HEAT GAIN OR LOSS
4.5 SOUND AND VIBRATION
4.6 PRESSURE CLASSIFICATION
Table 4-1 HVAC Duct Pressure Velocity Classification <\/td>\n<\/tr>\n
84<\/td>\n4.7 DUCT LEAKAGE
4.8 FAN SIZING
4.9 TESTING, ADJUSTING AND BALANCING (TAB)
4.10 FINAL DESIGN DOCUMENTS <\/td>\n<\/tr>\n
85<\/td>\nFIGURE 4-1 DUCT PRESSURE CLASS DESIGNATION (I-P) <\/td>\n<\/tr>\n
86<\/td>\nFIGURE 4-1M DUCT PRESSURE CLASS DESIGNATION (SI) <\/td>\n<\/tr>\n
87<\/td>\nFIGURE 4-2 SYMBOLS FOR VENTILATION AND AIR CONDITIONING (I-P) <\/td>\n<\/tr>\n
88<\/td>\nFIGURE 4-2M SYMBOLS FOR VENTILATION AND AIR CONDITIONING (SI) <\/td>\n<\/tr>\n
91<\/td>\nCHAPTER 5 DUCT DESIGN FUNDAMENTALS
5.1 SCOPE
5.2 FLUID PROPERTIES <\/td>\n<\/tr>\n
92<\/td>\n5.3 FLUID STATICS
FIGURE 5-1 CAPILLARY ACTION <\/td>\n<\/tr>\n
93<\/td>\n5.4 FLUID DYNAMICS
FIGURE 5-2 VELOCITY PROFILE <\/td>\n<\/tr>\n
94<\/td>\nFIGURE 5-3 RELATION BETWEEN FRICTION FACTOR AND REYNOLDS NUMBER <\/td>\n<\/tr>\n
96<\/td>\n5.5 FLUID FLOW PATTERNS <\/td>\n<\/tr>\n
97<\/td>\nFIGURE 5-4 VELOCITY PROFILES OF FLOW IN DUCTS
FIGURE 5-5 SEPARATION IN FLOW IN A DIFFUSER <\/td>\n<\/tr>\n
98<\/td>\nFIGURE 5-6 CHANGING VELOCITY PROFILES AT A MITERED ELBOW
FIGURE 5-7 EFFECT OF DUCT LENGTH ON DAMPER ACTION <\/td>\n<\/tr>\n
99<\/td>\n5.6 DUCT SYSTEM PRESSURES <\/td>\n<\/tr>\n
100<\/td>\n5.7 FRICTION LOSSES <\/td>\n<\/tr>\n
102<\/td>\n5.8 DYNAMIC LOSSES <\/td>\n<\/tr>\n
104<\/td>\n5.9 BASIC DUCT SIZING <\/td>\n<\/tr>\n
105<\/td>\nFIGURE 5-8 PART DUCT FRICTION LOSS CHART (I-P) <\/td>\n<\/tr>\n
106<\/td>\n5.10 DUCT CONFIGURATIONS
FIGURE 5-9 PART DUCT FRICTION LOSS CHART (SI) <\/td>\n<\/tr>\n
108<\/td>\n5.11 DUCT FITTINGS <\/td>\n<\/tr>\n
112<\/td>\n5.12 SYSTEM PRESSURE CHANGES <\/td>\n<\/tr>\n
114<\/td>\nFIGURE 5-10 PRESSURE CHANGES DURING FLOW-IN DUCTS
FIGURE 5-11 RETURN AIR DUCT EXAMPLE <\/td>\n<\/tr>\n
115<\/td>\n5.13 STRAIGHT DUCT LOSSES
5.14 DYNAMIC LOSSES <\/td>\n<\/tr>\n
117<\/td>\n5.15 SPLITTER VANES
5.16 TURNING VANES
FIGURE 5-12 TO CALCULATE SPLITTER VANE SPACING FOR A SMOOTH RADIUS RECTANGULAR ELBOW <\/td>\n<\/tr>\n
118<\/td>\nFIGURE 5-13 TURNING VANES RESEARCH <\/td>\n<\/tr>\n
119<\/td>\nFIGURE 5-14 TURBULENCE CAUSED BY IMPROPER MOUNTING AND USE OF TURNING VANES <\/td>\n<\/tr>\n
120<\/td>\n5.17 PRESSURE LOSSES IN DIVIDED-FLOW FITTINGS
FIGURE 5-15 PROPER INSTALLATION OF TURNING VANES <\/td>\n<\/tr>\n
121<\/td>\n5.18 LOSSES DUE TO AREA CHANGES
5.19 OTHER LOSS COEFFICIENTS <\/td>\n<\/tr>\n
122<\/td>\n5.20 OBSTRUCTION AVOIDANCE
FIGURE 5-16 AMCA DAMPER TESTS
FIGURE 5-17 DUCT OBSTRUCTIONS <\/td>\n<\/tr>\n
123<\/td>\nTable 5-1 Unsealed Longitudinal Seam Leakage For Metal Ducts <\/td>\n<\/tr>\n
124<\/td>\n5.21 DUCT AIR LEAKAGE
FIGURE 5-18 EXAMPLE 5-5 FAN\/SYSTEM CURVE <\/td>\n<\/tr>\n
125<\/td>\nFIGURE 5-19 DUCT LEAKAGE CLASSIFICATIONS <\/td>\n<\/tr>\n
126<\/td>\nTable 5-2 Applicable Leakage Classesa
Table 5-3 Leakage As A Percentage of System Airflow <\/td>\n<\/tr>\n
128<\/td>\n5.22 DUCT HEAT GAIN\/LOSS <\/td>\n<\/tr>\n
130<\/td>\n5.23 SMACNA DUCT RESEARCH
FIGURE 5-20 RECTANGULAR ELBOW 90 DEGREE THROAT, 90 DEGREE HEEL <\/td>\n<\/tr>\n
131<\/td>\n5.24 FAN PRESSURES
FIGURE 5-21 DIFFERENT CONFIGURATION ELBOW RESEARCH <\/td>\n<\/tr>\n
132<\/td>\n5.25 FAN DEFINITIONS
FIGURE 5-22 END TAP RESEARCH <\/td>\n<\/tr>\n
133<\/td>\nFIGURE 5-23 FAN TOTAL PRESSURE (TP)
FIGURE 5-24 FAN STATIC PRESSURE (SP)
FIGURE 5-25 FAN VELOCITY PRESSURE (VP) <\/td>\n<\/tr>\n
134<\/td>\n5.26 FAN LAWS
FIGURE 5-26 TIP SPEED <\/td>\n<\/tr>\n
135<\/td>\nFIGURE 5-27 CENTRIFUGAL FAN COMPONENTS <\/td>\n<\/tr>\n
136<\/td>\n5.27 FAN TESTING
5.28 FAN CLASSIFICATIONS
5.29 FAN TYPES
FIGURE 5-28 AXIAL FAN COMPONENTS <\/td>\n<\/tr>\n
137<\/td>\nFIGURE 5-29 METHOD OF OBTAINING FAN PERFORMANCE CURVES
FIGURE 5-30 CHARACTERISTIC CURVES FOR FC FANS <\/td>\n<\/tr>\n
138<\/td>\nFIGURE 5-31 CHARACTERISTIC CURVES FOR BI FANS
FIGURE 5-32 CHARACTERISTIC CURVES FOR AIRFOIL FANS
FIGURE 5-33 TUBULAR CENTRIFUGAL FAN <\/td>\n<\/tr>\n
139<\/td>\n5.30 FAN CURVES
FIGURE 5-34 CHARACTERISTIC CURVES FOR TUBULAR CENTRIFUGAL FANS
FIGURE 5-35 CHARACTERISTIC CURVES FOR PROPELLER FANS
FIGURE 5-36 CHARACTERISTIC CURVES FOR VANEAXIAL FANS <\/td>\n<\/tr>\n
140<\/td>\nFIGURE 5-37 APPLICATION OF THE FAN LAWS <\/td>\n<\/tr>\n
141<\/td>\nFIGURE 5-38 CENTRIFUGAL FAN PERFORMANCE TABLE (I-P)
FIGURE 5-39 CENTRIFUGAL FAN PERFORMANCE TABLE (METRIC UNITS) <\/td>\n<\/tr>\n
142<\/td>\n5.31 DUCT SYSTEM AIRFLOW
5.32 SYSTEM CURVES
FIGURE 5-40 SYSTEM RESISTANCE CURVE <\/td>\n<\/tr>\n
143<\/td>\nFIGURE 5-41 FAN CURVE PLOTS <\/td>\n<\/tr>\n
144<\/td>\nFIGURE 5-42 NORMALIZED DUCT SYSTEM CURVES
FIGURE 5-43 OPERATING POINT
FIGURE 5-44 VARIATIONS FROM DESIGN ” AIR SHORTAGE <\/td>\n<\/tr>\n
145<\/td>\nFIGURE 5-45 EFFECT OF 10 PERCENT INCREASE IN FAN SPEED <\/td>\n<\/tr>\n
146<\/td>\n5.33 AIR DENSITY EFFECTS
FIGURE 5-46 INTERACTIONS OF SYSTEM CURVES AND FAN CURVE
FIGURE 5-47 EFFECT OF DENSITY CHANGE (CONSTANT VOLUME) <\/td>\n<\/tr>\n
147<\/td>\nFIGURE 5-48 EFFECT OF DENSITY CHANGE (CONSTANT STATIC PRESSURE) <\/td>\n<\/tr>\n
148<\/td>\n5.34 ESTIMATING SYSTEM RESISTANCE
FIGURE 5-49 EFFECT OF DENSITY CHANGE (CONSTANT MASS FLOW) <\/td>\n<\/tr>\n
149<\/td>\n5.35 SAFETY FACTORS
5.36 THE FAN OUTLET
FIGURE 5-50 DUCT SYSTEM CURVE NOT AT DESIGN POINT <\/td>\n<\/tr>\n
150<\/td>\nFIGURE 5-51 AMCA FAN TEST ” PITOT TUBE <\/td>\n<\/tr>\n
151<\/td>\nFIGURE 5-52 ESTABLISHMENT OF A UNIFORM VELOCITY PROFILE <\/td>\n<\/tr>\n
152<\/td>\nFIGURE 5-53 EFFECTS OF SYSTEM EFFECT <\/td>\n<\/tr>\n
153<\/td>\n5.37 THE FAN INLET
FIGURE 5-54 SYSTEM EFFECT CURVES FOR INLET DUCT ELBOWS ” AXIAL FANS <\/td>\n<\/tr>\n
154<\/td>\n5.38 ASHRAE METHODS <\/td>\n<\/tr>\n
155<\/td>\nTable 5-4 K Values for Outlet Ducts <\/td>\n<\/tr>\n
156<\/td>\n5.39 FUNDAMENTALS HANDBOOK
Table 5-5 K Values for Single Width, Single Inlet Fans (SWSI) <\/td>\n<\/tr>\n
157<\/td>\n5.40 DEFICIENT FAN PERFORMANCE
5.41 SYSTEM EFFECT FACTORS <\/td>\n<\/tr>\n
158<\/td>\nFIGURE 5-55 SAMPLE ASHRAE FAN SYSTEM EFFECT \u201cLOSS COEFFICIENTS\u201d\u009d <\/td>\n<\/tr>\n
159<\/td>\nFIGURE 5-56 CHANGES FROM SYSTEM EFFECT <\/td>\n<\/tr>\n
160<\/td>\n5.42 BUILDING PRESSURES
FIGURE 5-57 SENSITIVITY OF SYSTEM VOLUME TO LOCATIONS OF BUILDING OPENINGS, INTAKES, AND EXHAUSTS <\/td>\n<\/tr>\n
161<\/td>\nFIGURE 5-58 BUILDING SURFACE FLOW PATTERNS <\/td>\n<\/tr>\n
162<\/td>\nFIGURE 5-59 PRESSURE DIFFERENCE DUE TO STACK EFFECT <\/td>\n<\/tr>\n
163<\/td>\n5.43 BUILDING AIRFLOW CONTROL
FIGURE 5-60 AIR MOVEMENTS DUE TO NORMAL AND REVERSE STACK EFFECT <\/td>\n<\/tr>\n
167<\/td>\nCHAPTER 6 FAN-DUCT CONNECTION PRESSURE LOSSES
6.1 SCOPE
6.2 FAN OUTLET CONDITIONS <\/td>\n<\/tr>\n
168<\/td>\nFIGURE 6-1 SYSTEM EFFECT CURVES <\/td>\n<\/tr>\n
169<\/td>\nFIGURE 6-2 CONTROLLED DIFFUSION AND ESTABLISHMENT OF A UNIFORM VELOCITY PROFILE IN A STRAIGHT LENGTH OF OUTLET DUCT <\/td>\n<\/tr>\n
170<\/td>\nTable 6-1 System Effect Curves for Outlet Ducts <\/td>\n<\/tr>\n
171<\/td>\nFIGURE 6-3 OUTLET DUCT ELBOWS <\/td>\n<\/tr>\n
172<\/td>\nTable 6-2 System Effect Factor Curves for Outlet Elbows <\/td>\n<\/tr>\n
173<\/td>\n6.3 FAN INLET CONDITIONS
FIGURE 6-4 PARALLEL VERSUS OPPOSED DAMPERS <\/td>\n<\/tr>\n
174<\/td>\nFIGURE 6-5 TYPICAL HVAC UNIT CONNECTIONS
FIGURE 6-6 TYPICAL INLET CONNECTIONS FOR CENTRIFUGAL AND AXIAL FANS <\/td>\n<\/tr>\n
175<\/td>\nFIGURE 6-7 NON-UNIFORM FLOW INTO A FAN INLET INDUCED BY A 90 DEGREE ROUND SECTION ELBOW – NO TURNING VANES
FIGURE 6-8 NON-UNIFORM FLOW INDUCED INTO FAN INLET BY A RECTANGULAR INLET DUCT <\/td>\n<\/tr>\n
176<\/td>\nFIGURE 6-9 SYSTEM EFFECTS FOR VARIOUS MITERED ELBOWS WITHOUT VANES <\/td>\n<\/tr>\n
177<\/td>\nFIGURE 6-10 SYSTEM EFFECTS FOR SQUARE DUCT ELBOWS <\/td>\n<\/tr>\n
178<\/td>\nFIGURE 6-11 EXAMPLE OF A FORCED INLET VORTEX (SPIN-SWIRL)
FIGURE 6-12 INLET DUCT CONNECTIONS CAUSING INLET SPIN <\/td>\n<\/tr>\n
179<\/td>\n6.4 EFFECTS OF FACTORY SUPPLIED ACCESSORIES
FIGURE 6-13 CORRECTIONS FOR INLET SPIN
FIGURE 6-14 AMCA STANDARD 210 FLOW STRAIGHTENER <\/td>\n<\/tr>\n
180<\/td>\nFIGURE 6-15 SYSTEM EFFECT CURVES FOR FANS LOCATED IN PLENUMS AND CABINET ENCLOSURES AND FOR VARIOUS WALL TO INLET DIMENSIONS
FIGURE 6-16 ENCLOSURE INLET NOT SYMMETRICAL WITH FAN INLET, PREROTATIONAL VORTEX INDUCED
FIGURE 6-17 FLOW CONDITION OF FIGURE 6-16 IMPROVED WITH A SPLITTER SHEET <\/td>\n<\/tr>\n
181<\/td>\nFIGURE 6-18 CENTRIFUGAL FAN INLET BOX <\/td>\n<\/tr>\n
182<\/td>\n6.5 CALCULATING SYSTEM EFFECT
Table 6-3 System Effect Curves for Inlet Obstructions
FIGURE 6-19 FREE INLET AREA PLANE – FAN WITH INLET COLLAR
FIGURE 6-20 FREE INLET AREA PLANE – FAN WITHOUT INLET COLLAR <\/td>\n<\/tr>\n
183<\/td>\nTable 6-4
FIGURE 6-21 TYPICAL NORMALIZED INLET VALVE CONTROL PRESSURE – VOLUME CURVE <\/td>\n<\/tr>\n
184<\/td>\nFIGURE 6-22 COMMON TERMINOLOGY FOR CENTRIFUGAL FAN APPURTRENANCES <\/td>\n<\/tr>\n
187<\/td>\nCHAPTER 7 DUCT SIZING PROCEDURES
7.1 SCOPE
7.2 DESIGN OBJECTIVES
7.3 DUCT SYSTEM SIZING PROCEDURES <\/td>\n<\/tr>\n
188<\/td>\n7.4 FITTING PRESSURE LOSS TABLES <\/td>\n<\/tr>\n
190<\/td>\n7.5 SUPPLY AIR DUCT SYSTEM-SIZING EXAMPLE 1 (I-P) <\/td>\n<\/tr>\n
191<\/td>\nFIGURE 7-1 DUCT SYSTEMS FOR DUCT SIZING EXAMPLES 1 AND 2 <\/td>\n<\/tr>\n
192<\/td>\nTable 7-1 Duct Sizing, Supply Air System – Example 1 <\/td>\n<\/tr>\n
193<\/td>\nTable 7-1 (a) Duct Sizing, Supply Air System – Example 1 (Continued) <\/td>\n<\/tr>\n
201<\/td>\nTable 7-2 Duct Sizing, Exhaust Air System ” Example 2 (I”P) <\/td>\n<\/tr>\n
202<\/td>\nTable 7-3 Duct Sizing, Exhaust Air System ” Example 3 (I”P) <\/td>\n<\/tr>\n
203<\/td>\nTable 7-3(a) Duct Sizing, Exhaust Air System ” Example 3 (I”P) (Continued) <\/td>\n<\/tr>\n
204<\/td>\n7.6 RETURN AIR (EXHAUST AIR) DUCT SYSTEM-SIZING EXAMPLE 2 <\/td>\n<\/tr>\n
207<\/td>\n7.7 SUPPLY AIR DUCT SYSTEM SIZING EXAMPLE 3 (I-P) <\/td>\n<\/tr>\n
209<\/td>\nFIGURE 7-2 SUPPLY AIR DUCT SYSTEM FOR SIZING EXAMPLE 3 <\/td>\n<\/tr>\n
212<\/td>\n7.8 EXTENDED PLENUM DUCT SIZING <\/td>\n<\/tr>\n
213<\/td>\nFIGURE 7-3 SYSTEM \u201cA\u201d\u009d ” SIZED BY EQUAL FRICTION METHOD <\/td>\n<\/tr>\n
214<\/td>\nTable 7-4 Semi-Extended Plenum Comparison
Table 7-5 Semi-Extended Plenum Installation Cost Comparison
FIGURE 7-4 SYSTEM \u201cB\u201d\u009d ” MODIFIED BY SEMI-EXTENDED PLENUM CONCEPT <\/td>\n<\/tr>\n
215<\/td>\nFIGURE 7-5 DUCT SIZING WORK SHEET (I-P) <\/td>\n<\/tr>\n
216<\/td>\nTable 7-6 Duct Sizing, Supply Air System ” Example 1 <\/td>\n<\/tr>\n
217<\/td>\nTable 7″6(a) Duct Sizing, Supply Air System ” Example 1 (Continued) <\/td>\n<\/tr>\n
218<\/td>\n7.9 DESIGN FUNDAMENTALS (SI)
7.10 SUPPLY AIR DUCT SYSTEM ” SIZING EXAMPLE. 1 (SI) <\/td>\n<\/tr>\n
219<\/td>\nFIGURE 7-6M DUCT SYSTEMS FOR DUCT SIZING EXAMPLES 1 AND 2 (SI) <\/td>\n<\/tr>\n
226<\/td>\n7.11 RETURN AIR (EXHAUST AIR) DUCT SYSTEM-SIZING EXAMPLE 2 (SI) <\/td>\n<\/tr>\n
230<\/td>\nTable 7-7 Duct Sizing, Exhaust Air System ” Example 2 (SI) <\/td>\n<\/tr>\n
231<\/td>\nTable 7-8 Duct Sizing, Supply Air System ” Example 3 <\/td>\n<\/tr>\n
232<\/td>\nTable 7″8(a) Duct Sizing, Supply Air System ” Example 3 (Continued) <\/td>\n<\/tr>\n
233<\/td>\n7.12 SUPPLY AIR DUCT SYSTEM SIZING EXAMPLE 3 (SI)
FIGURE 7-7M SUPPLY AIR DUCT SYSTEM FOR SIZING EXAMPLE 3 <\/td>\n<\/tr>\n
238<\/td>\n7.13 EXTENDED PLENUM DUCT SIZING <\/td>\n<\/tr>\n
239<\/td>\nTable 7-9 Semi-Extended Plenum Comparison
Table 7-10 Semi-Extended Plenum Installation Cost Comparison
FIGURE 7-8M SYSTEMS \u201cA\u201d\u009d SIZED BY EQUAL FRICTION METHOD <\/td>\n<\/tr>\n
240<\/td>\nFIGURE 7-9M \u201cB\u201d\u009d MODIFIED BY SEMI-EXTENDED PLENUM CONCEPT <\/td>\n<\/tr>\n
241<\/td>\nFIGURE 7-10 DUCT SIZING WORK SHEET (I-P) <\/td>\n<\/tr>\n
242<\/td>\nFIGURE 7-10M DUCT SIZING WORK SHEET (SI) <\/td>\n<\/tr>\n
245<\/td>\nCHAPTER 8 PRESSURE LOSS OF SYSTEMS COMPONENTS
8.1 SCOPE
8.2 USE OF TABLES AND CHARTS
Table 8-1 Filter Pressure Loss Data <\/td>\n<\/tr>\n
247<\/td>\nFIGURE 8-1 SYSTEM PRESSURE LOSS CHECK LIST <\/td>\n<\/tr>\n
248<\/td>\nTable 8-2 Louver Free Area Chart 2 in. Blades at 45 Degree Angle <\/td>\n<\/tr>\n
249<\/td>\nTable 8-3 Louver Free Area Chart 4 in. Blades at 45 Degree Angle <\/td>\n<\/tr>\n
250<\/td>\nTable 8-4 Louver Free Area Chart 6 in. Blades at 45 Degree Angle <\/td>\n<\/tr>\n
252<\/td>\n8.3 DAMPER CHARTS
FIGURE 8-2 VOLUME DAMPERS (*BASED UPON AMCA CERTIFIED VOLUME DAMPERS)
FIGURE 8-3 BACKDRAFT OR RELIEF DAMPERS
FIGURE 8-4 2-HOUR FIRE & SMOKE DAMPERS (BASED ON AMCA CERTIFIED FIRE DAMPERS) <\/td>\n<\/tr>\n
253<\/td>\n8.4 DUCT SYSTEM APPARATUS CHARTS
FIGURE 8-5 HEATING COILS WITH 1 ROW
FIGURE 8-6 HEATING COILS WITH 2 ROWS
FIGURE 8-7 HEATING COILS WITH 3 ROWS
FIGURE 8-8 HEATING COILS WITH 4 ROWS <\/td>\n<\/tr>\n
254<\/td>\nFIGURE 8-9 COOLING COILS (WET) 4 ROW
FIGURE 8-10 COOLING COILS (WET) 6 ROW
FIGURE 8-11 COOLING COILS (WET) 8 ROW
FIGURE 8-12 AIR MONITOR DEVICE <\/td>\n<\/tr>\n
255<\/td>\nFIGURE 8-13 LOUVERS WITH 45 BLADE ANGLE (*BASED ON AMCA CERTIFIED LOUVERS)
FIGURE 8-14 3 RECTANGULAR SOUND TRAPS ” 3 FOOT (1M)
FIGURE 8-15 RECTANGULAR SOUND TRAPS ” 5 FOOT (1.5M)
FIGURE 8-16 RECTANGULAR SOUND TRAPS ” 7 FOOT (2M) <\/td>\n<\/tr>\n
256<\/td>\nFIGURE 8-17 RECTANGULAR SOUND TRAPS ” 10 FOOT (3M)
FIGURE 8-18 ROUND SOUND TRAPS
FIGURE 8-19 ELIMINATORS THREE BEND
FIGURE 8-20 AIR WASHER <\/td>\n<\/tr>\n
257<\/td>\nFIGURE 8-21 SCREENS
FIGURE 8-22 AIR-TO-AIR PLATE EXCHANGERS (MODULAR)
FIGURE 8-23 AIR-TO-AIR SINGLE TUBE EXCHANGERS
FIGURE 8-24 ROTARY WHEEL EXCHANGER <\/td>\n<\/tr>\n
258<\/td>\nFIGURE 8-25 MULTIPLE TOWER ENERGY EXCHANGERS
FIGURE 8-26 DRY AIR EVAPORATIVE COOLER <\/td>\n<\/tr>\n
259<\/td>\n8.5 ROOM AIR TERMINAL DEVICES
Table 8-5 Air Outlets & Diffusers ” Total Pressure Loss Average
Table 8-6 Supply Registers ” Total Pressure Loss Average
Table 8-7 Return Registers ” Total Pressure Loss Average <\/td>\n<\/tr>\n
260<\/td>\nTable 8-8 Typical Design Velocities <\/td>\n<\/tr>\n
261<\/td>\n8.6 LOUVER DESIGN DATA
FIGURE 8-27 RECOMMENDED CRITERIA FOR LOUVER SIZING <\/td>\n<\/tr>\n
265<\/td>\nCHAPTER 9 PROVISIONS FOR TESTING, ADJUSTING, AND BALANCING
9.1 SCOPE
9.2 TAB DESIGN CONSIDERATIONS <\/td>\n<\/tr>\n
266<\/td>\nFIGURE 9-1 DESIGN CONSIDERATIONS FOR DIFFUSER LAYOUTS AND BALANCING DAMPER LOCATIONS <\/td>\n<\/tr>\n
267<\/td>\nFIGURE 9-2 DUCT DESIGN CONSIDERATIONS FOR SUGGESTED BALANCING DAMPER LOCATIONS <\/td>\n<\/tr>\n
268<\/td>\nFIGURE 9-3 DESIGN CONSIDERATIONS TO MINIMIZE AIRFLOW TURBULENCE AND STRATIFICATION FROM TERMINAL BOXES <\/td>\n<\/tr>\n
269<\/td>\n9.3 AIR MEASUREMENT DEVICES
9.4 BALANCING WITH ORIFICES
9.5 PROVISIONS FOR TAB IN SYSTEM DESIGN <\/td>\n<\/tr>\n
270<\/td>\n9.6 LABORATORY TESTING
FIGURE 9-4 FAN RATING TEST <\/td>\n<\/tr>\n
271<\/td>\n9.7 FIELD TESTING AND BALANCING <\/td>\n<\/tr>\n
273<\/td>\nFIGURE 9-5 TYPICAL VELOCITY PROFILES ENCOUNTERED IN VELOCITY PRESSURE MEASUREMENT PLANES <\/td>\n<\/tr>\n
274<\/td>\n9.8 TEST INSTRUMENTATION <\/td>\n<\/tr>\n
275<\/td>\nTable 9-1 Airflow Measuring Instruments <\/td>\n<\/tr>\n
279<\/td>\nCHAPTER 10 DESIGNING FOR SOUND AND VIBRATION
10.1 SCOPE
10.2 BUILDING NOISE
FIGURE 10-1 SOURCE, PATH, AND RECEIVER <\/td>\n<\/tr>\n
280<\/td>\n10.3 HVAC NOISE
FIGURE 10-2 MECHANICAL EQUIPMENT ROOM ADJACENT TO OFFICE AREA <\/td>\n<\/tr>\n
281<\/td>\nFIGURE 10-3 ILLUSTRATION OF WELL- BALANCED HVAC SOUND SPECTRUM FOR OCCUPIED SPACES <\/td>\n<\/tr>\n
282<\/td>\nFIGURE 10-4 FREQUENCY RANGES OF THE MOST LIKELY SOURCES OF ACOUSTICAL COMPLAINTS
FIGURE 10-5 FREQUENCY AT WHICH DIFFERENT TYPES OF MECHANICAL EQUIPMENT GENERALLY CONTROL SOUND SPECTRA <\/td>\n<\/tr>\n
283<\/td>\nTable 10-1 Sound Sources, Transmission Paths, and Recommended Noise Reduction Methods <\/td>\n<\/tr>\n
284<\/td>\n10.4 COMMON SOUND SOURCES <\/td>\n<\/tr>\n
285<\/td>\n10.5 SOUND DATA STANDARDS
10.6 DUCT NOISE <\/td>\n<\/tr>\n
286<\/td>\n10.7 DUCT SILENCERS <\/td>\n<\/tr>\n
287<\/td>\nFIGURE 10-6 DISSIPATIVE PASSIVE DUCT SILENCERS
FIGURE 10-7 ACTIVE DUCT SILENCER <\/td>\n<\/tr>\n
288<\/td>\n10.8 ACOUSTIC LAGGING
10.9 DUCT SOUND BREAKOUT
FIGURE 10-8 EXTERNAL DUCT LAGGING ON RECTANGULAR DUCTS <\/td>\n<\/tr>\n
289<\/td>\nFIGURE 10-9 BREAKOUT AND BREAK-IN OF SOUND IN DUCTS <\/td>\n<\/tr>\n
293<\/td>\nCHAPTER 11 DUCT SYSTEM CONSTRUCTION
11.1 SCOPE
11.2 DUCT SYSTEM SPECIFICATION CHECK LIST
11.3 DUCT CONSTRUCTION MATERIALS <\/td>\n<\/tr>\n
296<\/td>\nTable 11-1 Sheet Metal Properties <\/td>\n<\/tr>\n
297<\/td>\n11.4 ASTM STANDARDS <\/td>\n<\/tr>\n
301<\/td>\nCHAPTER 12 SPECIAL DUCT SYSTEMS
12.1 SCOPE
12.2 KITCHEN AND MOISTURE – LADEN SYSTEMS
12.3 SYSTEMS HANDLING SPECIAL GASES
12.4 INDUSTRIAL DUCT <\/td>\n<\/tr>\n
307<\/td>\nAPPENDIX A DUCT DESIGN TABLES AND CHARTS <\/td>\n<\/tr>\n
308<\/td>\nFIGURE A-1 DUCT FRICTION LOSS CHART <\/td>\n<\/tr>\n
309<\/td>\nFIGURE A-1M DUCT FRICTION LOSS CHART <\/td>\n<\/tr>\n
310<\/td>\nTable A-1 Duct Material Roughness Factors <\/td>\n<\/tr>\n
311<\/td>\nFIGURE A-2 DUCT FRICTION LOSS CORRECTION FACTORS <\/td>\n<\/tr>\n
312<\/td>\nTable A-2 Circulation Equivalents of Rectangular Ducts for Equal Friction and Capacity Dimensions (I-P) <\/td>\n<\/tr>\n
313<\/td>\nTable A-2 Circulation Equivalents of Rectangular Ducts for Equal Friction and Capacity Dimensions (I-P) (continued) <\/td>\n<\/tr>\n
314<\/td>\nTable A-2M Circular Equivalents of Rectangular Ducts for Equal Friction and Capacity Dimensions (SI) <\/td>\n<\/tr>\n
316<\/td>\nTable A-3 Spiral Flat-Oval Duct (Nominal Sizes) <\/td>\n<\/tr>\n
317<\/td>\nTable A-3M Spiral Flat-Oval Duct (Nominal Sizes) <\/td>\n<\/tr>\n
318<\/td>\nTable A-4 Velocities\/Velocity Pressures
FIGURE A-3 CORRECTION FACTOR FOR UNEXTENDED FLEXIBLE DUCT <\/td>\n<\/tr>\n
319<\/td>\nTable A-4M Velocities\/Velocity Pressures
Table A-5 Angular Conversion <\/td>\n<\/tr>\n
320<\/td>\nTable A-6 Loss Coefficients for Straight-Through Flow
FIGURE A-4 AIR DENSITY FRICTION CHART CORRECTION FACTORS <\/td>\n<\/tr>\n
321<\/td>\nFITTING LOSS COEFFICIENT TABLES
Table A-7 Loss Coefficients, Elbows <\/td>\n<\/tr>\n
322<\/td>\nTable A-7 Loss Coefficients, Elbows (continued) <\/td>\n<\/tr>\n
323<\/td>\nTable A-7 Loss Coefficients, Elbows (continued) <\/td>\n<\/tr>\n
324<\/td>\nTable A-7 Loss Coefficients, Elbows (continued) <\/td>\n<\/tr>\n
325<\/td>\nTable A-7 Loss Coefficients, Elbows (continued) <\/td>\n<\/tr>\n
326<\/td>\nTable A-8 Loss Coefficients, Transitions (Diverging Flow) <\/td>\n<\/tr>\n
327<\/td>\nTable A-8 Loss Coefficients, Transitions (Diverging Flow) (continued) <\/td>\n<\/tr>\n
328<\/td>\nTable A-8 Loss Coefficients, Transitions (Diverging Flow) (continued) <\/td>\n<\/tr>\n
329<\/td>\nTable A-9 Loss Coefficients, Transitions (Converging Flow) <\/td>\n<\/tr>\n
330<\/td>\nTable A-9 Loss Coefficients, Transitions (Converging Flow) (continued)
Table A-10 Loss Coefficients, Converging Junctions (Tees, Wyes) <\/td>\n<\/tr>\n
331<\/td>\nTable A-10 Loss Coefficients, Converging Junctions (Tees, Wyes) (continued) <\/td>\n<\/tr>\n
332<\/td>\nTable A-10 Loss Coefficients, Converging Junctions (Tees, Wyes) (continued) <\/td>\n<\/tr>\n
333<\/td>\nTable A-10 Loss Coefficients, Converging Junctions (Tees, Wyes) (continued) <\/td>\n<\/tr>\n
334<\/td>\nTable A-10 Loss Coefficients, Converging Junctions (Tees, Wyes) (continued) <\/td>\n<\/tr>\n
335<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Tees, Wyes) <\/td>\n<\/tr>\n
336<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Tees, Wyes) (Continued) <\/td>\n<\/tr>\n
337<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Tees, Wyes) (Continued) <\/td>\n<\/tr>\n
338<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Tees, Wyes) (Continued) <\/td>\n<\/tr>\n
339<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Tees, Wyes) (Continued) <\/td>\n<\/tr>\n
340<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Tees, Wyes) (Continued) <\/td>\n<\/tr>\n
341<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Tees, Wyes) (Continued) <\/td>\n<\/tr>\n
342<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Tees, Wyes) (Continued) <\/td>\n<\/tr>\n
343<\/td>\nTable A-11 Loss Coefficients, Diverging Junctions (Continued)
Table A-12 Loss Coefficients, Entries <\/td>\n<\/tr>\n
344<\/td>\nTable A-12 Loss Coefficients, Entries (Continued) <\/td>\n<\/tr>\n
345<\/td>\nTable A-12 Loss Coefficients, Entries (Continued) <\/td>\n<\/tr>\n
346<\/td>\nTable A-12 Loss Coefficients, Entries (Continued)
Table A-13 Loss Coefficients, Exits <\/td>\n<\/tr>\n
347<\/td>\nTable A-13 Loss Coefficients, Exits (Continued) <\/td>\n<\/tr>\n
348<\/td>\nTable A-13 Loss Coefficients, Exits (Continued) <\/td>\n<\/tr>\n
349<\/td>\nTable A-13 Loss Coefficients, Exits (Continued) <\/td>\n<\/tr>\n
350<\/td>\nTable A-14 Loss Coefficients, Screens and Plates <\/td>\n<\/tr>\n
351<\/td>\nTable A-15 Loss Coefficients, Obstructions (Constant Velocities) <\/td>\n<\/tr>\n
352<\/td>\nTable A-15 Loss Coefficients, Obstructions (Continued) <\/td>\n<\/tr>\n
353<\/td>\nTable A-15 Loss Coefficients, Obstructions (Continued) <\/td>\n<\/tr>\n
354<\/td>\nTable A-15 Loss Coefficients, Obstructions (Continued) <\/td>\n<\/tr>\n
355<\/td>\nFIGURE A-5 DUCT HEAT TRANSFER COEFFICIENTS <\/td>\n<\/tr>\n
356<\/td>\nFIGURE A-5M DUCT HEAT TRANSFER COEFFICIENTS <\/td>\n<\/tr>\n
357<\/td>\nHVAC EQUATIONS (I-P) <\/td>\n<\/tr>\n
359<\/td>\nTable A-16 Converting Pressure In Inches of Mercury to Feet of Water at Various Water Temperatures <\/td>\n<\/tr>\n
360<\/td>\nTable A-17 Air Density Correction Factors <\/td>\n<\/tr>\n
361<\/td>\nTable A-17M Air Density Correction Factors <\/td>\n<\/tr>\n
362<\/td>\nHVAC EQUATIONS (SI) <\/td>\n<\/tr>\n
365<\/td>\nSI UNITS AND EQUIVALENTS
Table A-18 SI Units (Basic and Derived) <\/td>\n<\/tr>\n
366<\/td>\nTable A-19 SI Equivalents <\/td>\n<\/tr>\n
367<\/td>\nTable A-20 Recommended NC-RC Levels For Different Indoor Activity Areas <\/td>\n<\/tr>\n
368<\/td>\nTable A-21 Listening Conditions And Telephone Use As A Function Of NC-RC Levels
Table A-22 Sound Sources, Transmission Paths, And Recommended Noise Reduction Methods <\/td>\n<\/tr>\n
369<\/td>\nTable A-23 Specific Sound Power Levels, Kw, For Fan Total Sound Power
Table A-24 Blade Frequency Increments (BFI)
Table A-25 Correction Factor, C, For Off-Peak Operation <\/td>\n<\/tr>\n
370<\/td>\nTable A-26 TLout vs. Frequency For Various Rectangular Ducts
Table A-27 TLin vs. Frequency For Various Rectangular Ducts
Table A-28 Experimentally Measured TLout vs. Frequency For Round Ducts <\/td>\n<\/tr>\n
371<\/td>\nTable A-29 Calculated TLout vs. Frequency For Round Ducts
Table A-30 Experimentally Determined TLin vs. Frequency For Round Ducts
Table A-31 Calculated TLin vs. Frequency For Round Ducts <\/td>\n<\/tr>\n
372<\/td>\nTable A-32 TLout vs. Frequency For Various Flat-Oval Ducts
Table A-33 TLin vs. Frequency For Various Flat-Oval Ducts
Table A-34 Absorption Coefficients For Selected Plenum Materials
Table A-35 Sound Attenuation In Unlined Rectangular Sheet Metal Ducts <\/td>\n<\/tr>\n
373<\/td>\nTable A-36 Insertion Loss For Rectangular Ducts With 1 in. Of Fiberglass Lining <\/td>\n<\/tr>\n
374<\/td>\nTable A-37 Insertion Loss For Rectangular Ducts With 2 in. Of Fiberglass Lining <\/td>\n<\/tr>\n
375<\/td>\nTable A-38 Sound Attenuation In Straight Round Ducts
Table A-39 Insertion Loss For Acoustically Lined Round Ducts – 1 in. Lining <\/td>\n<\/tr>\n
376<\/td>\nTable A-40 Insertion Loss For Acoustically Lined Round Ducts\u20142 in. Lining <\/td>\n<\/tr>\n
377<\/td>\nTable A-41 Insertion Loss For Acoustically Lined Round Ducts\u20143 in. Lining
Table A-42 Insertion Loss Of Unlined And Lined Square Elbows Without Turning Vanes <\/td>\n<\/tr>\n
378<\/td>\nTable A-43 Insertion Loss Of Round Elbows
Table A-44 Insertion Loss Of Unlined And Lined Square Elbows With Turning Vanes
Table A-45 7 ft, Rectangular, Standard Pressure Drop Duct Silencers <\/td>\n<\/tr>\n
379<\/td>\nTable A-46 7 ft, Rectangular, Low Pressure Drop Duct Silencers
Table A-47 Round, High Pressure Drop Duct Silencers <\/td>\n<\/tr>\n
380<\/td>\nTable A-48 Round, Low Pressure Drop Duct Silencers
Table A-49 Coefficients For Determining Static Pressure Drop Across Duct Silencers
Table A-50 Coefficient For System Component Effect On Duct Silencers <\/td>\n<\/tr>\n
381<\/td>\nTable A-51 Transmission Loss Values For Ceiling Materials
Table A-52 Correction Coefficient \u201c \u201d\u009d For Different Types Of Ceilings
Table A-53 Average Sound Absorption Coefficients, , For Typical Receiving Rooms <\/td>\n<\/tr>\n
382<\/td>\nTable A-54 Air Absorption Coefficients
Table A-55 Decibel Equivalents Of Numbers (N) <\/td>\n<\/tr>\n
383<\/td>\nTable A-56 Five Place Logarithms <\/td>\n<\/tr>\n
384<\/td>\nTable A-57 Natural Trigonometric Functions <\/td>\n<\/tr>\n
387<\/td>\nINDEX <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

HVAC Systems-Duct Design, 4th Edition<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
SMACNA<\/b><\/a><\/td>\n2006<\/td>\n392<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":28958,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2703],"product_tag":[],"class_list":{"0":"post-28957","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-smacna","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/28957","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/28958"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=28957"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=28957"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=28957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}