Auto-Zone Control Systems Zoning Design Guide (Version 01B) - Manual (Page 20)

20 Auto-Zone Systems
Zoning Design Guide
Zoning Design Procedures
damper has a height of 10”. In this case the damper
would utilize an 8” blade and a 2” blade stop or dam
would be installed across the base of the damper. Tak-
ing into consideration the “blade stop” and the frame, a
10 x 10 damper would have a reduced opening of 6 x 8
inside the duct. Many contractors have experienced low
air flow problems on projects only to discover this hid-
den problem of the dampers actually creating the re-
striction. Auto-Zone utilizes a variety of blade widths
in order to accommodate the size of the damper instead
of the damper trying to accommodate the size of the
blade.
Rectangular Dampers
Table 1-2: Rectangular Damper Selection Data
Damper
Height
“B”
8” 10” 12” 14” 16” 18” 20” 22” 24” 26” 28” 30” 32” 34” 36”
Damper
Width
“A”
Airflow Data with Full Open Damper – CFM @ 1000 FPM Velocity
( ∆P
S
- inches W.C. @ 1000 FPM Velocity)
For airflow CFM at other velocities use these multipliers: 750 FPM = 0.75, 1250 FPM = 1.25, 1500 FPM = 1.5, 2000 = 2.0, 2250 = 2.25
8” 410
(0.16)
530
(0.10)
640
(0.07)
740
(0.05)
850
(0.04)
970
(0.03)
1080
(0.03)
1190
(0.02)
1300
(0.02)
1410
(0.02)
1520
(0.01)
1630
(0.02)
1740
(0.01)
1850
(0.01)
1970
(0.01)
10” 510
(0.10)
590
(0.07)
690
(0.05)
800
(0.03)
910
(0.03)
1030
(0.02)
1150
(0.02)
1260
(0.01)
1380
(0.01)
1500
(0.01)
1610
(0.01)
1730
(0.01)
1840
(0.01)
2000
(0.01)
2080
(0.01)
12” 560
(0.07)
650
(0.05)
730
(0.03)
850
(0.02)
970
(0.02)
1090
(0.01)
1210
(0.01)
1330
(0.01)
1460
(0.01)
1580
(0.01)
1700
(0.01)
1820
(0.01)
1940
(-)
2060
(-)
2190
(-)
14” 660
(0.05)
770
(0.03)
880
(0.02)
1030
(0.02)
1180
(0.01)
1330
(0.01)
1480
(0.01)
1630
(0.01)
1760
(0.01)
1910
(0.01)
2060
(-)
2210
(-)
2360
(-)
2510
(-)
2640
(-)
16” 750
(0.04)
890
(0.03)
1030
(0.02)
1200
(0.01)
1370
(0.01)
1540
(0.01)
1710
(0.01)
1880
(0.01)
2060
(-)
2230
(-)
2400
(-)
2570
(-)
2740
(-)
2910
(-)
3090
(-)
18” 770
(0.03)
980
(0.03)
1180
(0.01)
1380
(0.01)
1580
(0.01)
1780
(0.01)
1980
(0.01)
2180
(-)
2350
(-)
2550
(-)
2750
(-)
2950
(-)
3150
(-)
3350
(-)
3540
(-)
20” 850
(0.03)
1090
(0.02)
1330
(0.01)
1550
(0.01)
1770
(0.01)
1990
(0.01)
2210
(-)
2430
(-)
2650
(-)
2870
(-)
3090
(-)
3310
(-)
3530
(-)
3750
(-)
3990
(-)
22” 930
(0.02)
1210
(0.01)
1480
(0.01)
1730
(0.01)
1980
(0.01)
2230
(-)
2480
(-)
2730
(-)
2950
(-)
3200
(-)
3450
(-)
3700
(-)
3950
(-)
4200
(-)
4440
(-)
24” 950
(0.02)
1290
(0.01)
1630
(0.01)
1900
(0.01)
2170
(-)
2440
(-)
2710
(-)
2980
(-)
3250
(-)
3520
(-)
3790
(-)
4060
(-)
4330
(-)
4600
(-)
4880
(-)
26” 990
(0.02)
1390
(0.01)
1780
(0.01)
2080
(0.01)
2380
(-)
2680
(-)
2980
(-)
3280
(-)
3550
(-)
3850
(-)
4150
(-)
4450
(-)
4750
(-)
NA NA
28” 1070
(0.01)
1500
(0.01)
1930
(0.01)
2250
(-)
2570
(-)
2890
(-)
3210
(-)
3530
(-)
3850
(-)
4170
(-)
4500
(-)
4820
(-)
NA NA NA
30” 1020
(0.01)
1550
(0.01)
2080
(0.01)
2430
(-)
2780
(-)
3130
(-)
3480
(-)
3830
(-)
4150
(-)
4500
(-)
4850
(-)
NA NA NA NA
32” 1090
(0.01)
1660
(0.01)
2230
(-)
2600
(-)
2970
(-)
3340
(-)
3710
(-)
4080
(-)
4450
(-)
4820
(-)
NA NA NA NA NA
34” 1150
(0.01)
1770
(0.01)
2380
(-)
2780
(-)
3180
(-)
3580
(-)
3980
(-)
4370
(-)
4750
(-)
NA NA NA NA NA NA
36” 1060
(0.01)
1790
(0.01)
2520
(-)
2670
(-)
3090
(-)
3510
(-)
3930
(-)
4350
(-)
5040
(-)
NA NA NA NA NA NA
WattMaster reserves the right to change specifications without notice