Table 1-2: Rectangular Damper Selection Data - York Meridian Technical Manual

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. Meridian 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.
Damper
Height
8" 10" 12"
"B"
Damper
Width
"A"
8" 410 530 640
(0.16) (0.10) (0.07)
10" 510 590 690
(0.10) (0.07) (0.05)
12" 560 650 730
(0.07) (0.05) (0.03)
14" 660 770 880
(0.05) (0.03) (0.02)
16" 750 890 1030
(0.04) (0.03) (0.02)
18" 770 980 1180
(0.03) (0.03) (0.01)
20" 850 1090 1330
(0.03) (0.02) (0.01)
22" 930 1210 1480
(0.02) (0.01) (0.01)
24" 950 1290 1630
(0.02) (0.01) (0.01)
26" 990 1390 1780
(0.02) (0.01) (0.01)
28" 1070 1500 1930
(0.01) (0.01) (0.01)
30" 1020 1550 2080
(0.01) (0.01) (0.01)
32" 1090 1660 2230
(0.01) (0.01)
34" 1150 1770 2380
(0.01) (0.01)
36" 1060 1790 2520
(0.01) (0.01)
20

Table 1-2: Rectangular Damper Selection Data

14" 16" 18"
Airflow Data with Full Open Damper
(∆P - inches W.C. @ 1000 FPM Velocity)
S
740 850 970
(0.05) (0.04) (0.03)
800 910 1030
(0.03) (0.03) (0.02)
850 970 1090
(0.02) (0.02) (0.01)
1030 1180 1330
(0.02) (0.01) (0.01)
1200 1370 1540
(0.01) (0.01) (0.01)
1380 1580 1780
(0.01) (0.01) (0.01)
1550 1770 1990
(0.01) (0.01) (0.01)
1730 1980 2230
(0.01) (0.01) (-)
1900 2170 2440
(0.01) (-) (-)
2080 2380 2680
(0.01) (-) (-)
2250 2570 2890
(-) (-) (-)
2430 2780 3130
(-) (-) (-)
2600 2970 3340
(-) (-) (-) (-)
2780 3180 3580
(-) (-) (-) (-)
2670 3090 3510
(-) (-) (-) (-)
York reserves the right to change specifications without notice
Rectangular Dampers
20" 22" 24" 26"
CFM @ 1000 FPM Velocity
1080 1190 1300 1410
(0.03) (0.02) (0.02) (0.02)
1150 1260 1380 1500
(0.02) (0.01) (0.01) (0.01)
1210 1330 1460 1580
(0.01) (0.01) (0.01) (0.01)
1480 1630 1760 1910
(0.01) (0.01) (0.01) (0.01)
1710 1880 2060 2230
(0.01) (0.01) (-) (-)
1980 2180 2350 2550
(0.01) (-) (-) (-)
2210 2430 2650 2870
(-) (-) (-) (-)
2480 2730 2950 3200
(-) (-) (-) (-)
2710 2980 3250 3520
(-) (-) (-) (-)
2980 3280 3550 3850
(-) (-) (-) (-)
3210 3530 3850 4170
(-) (-) (-) (-)
3480 3830 4150 4500
(-) (-) (-) (-)
3710 4080 4450 4820
(-) (-) (-) (-)
3980 4370 4750 NA
(-) (-) (-)
3930 4350 5040 NA
(-) (-) (-)
036-21478-001 Rev. A (0802)
28" 30" 32" 34"
1520 1630 1740 1850
(0.01) (0.02) (0.01) (0.01)
1610 1730 1840 2000
(0.01) (0.01) (0.01) (0.01)
1700 1820 1940 2060
(0.01) (0.01) (-) (-)
2060 2210 2360 2510
(-) (-) (-) (-)
2400 2570 2740 2910
(-) (-) (-) (-)
2750 2950 3150 3350
(-) (-) (-) (-)
3090 3310 3530 3750
(-) (-) (-) (-)
3450 3700 3950 4200
(-) (-) (-) (-)
3790 4060 4330 4600
(-) (-) (-) (-)
4150 4450 4750 NA
(-) (-) (-)
4500 4820 NA NA
(-) (-)
4850 NA NA NA
(-)
NA NA NA NA
NA NA NA NA
NA NA NA NA
Meridian Systems

36"
1970
(0.01)
2080
(0.01)
2190
(-)
2640
(-)
3090
(-)
3540
(-)
3990
(-)
4440
(-)
4880
(-)
NA
NA
NA
NA
NA
NA