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ENVIRONMENTAL TECHNOLOGIES
Box Type & Model
Inlet Size (in.)
CFM @ 1"
Area
K (Box Constant)
4" Round
248
0.079
1.628
Models: SDR / CFR / VFR
5" Round
392
0.126
1.657
6" Round
433
0.184
2.896
Newer style as of 10/92
8" Round
841
0.333
2.515
10" Round
1355
0.525
2.408
12" Round
1976
0.761
2.379
90 deg travel, clockwise to close
14" Round
2750
1.040
2.294
16" Round
3596
1.360
2.294
19" Round
6377
2.720
2.918
22" Round
8760
3.555
2.642
4" Round
276
0.09
1.71
Models: SSD / CVF / VVF / SDD
5" Round
431
0.14
1.69
6" Round
620
0.20
1.67
Older style prior to 10/92
8" Round
1104
0.35
1.61
10" Round
1631
0.52
1.63
12" Round
2180
0.69
1.61
45 deg travel, clockwise to close
14" Round
2728
0.86
1.59
16" Round
3280
1.04
1.61
18" Round
3840
1.21
1.59
20" Round
4634
1.47
1.61
24" Round
5797
1.83
1.60
KRUEGER
Box Type & Model
Inlet Size (in.)
CFM @ 1"
Area
K (Box Constant)
4" Round
235
0.09
2.35
Single Duct Cooling Only: DLMHS
5" Round
375
0.14
2.36
6" Round
530
0.20
2.28
Fan Powered Series Fan: DQFC / QFC-Q
7" Round
730
0.27
2.19
8" Round
945
0.35
2.20
9" Round
1200
0.44
2.16
10" Round
1450
0.55
2.31
90 deg travel, clockwise to close
12" Round
2150
0.79
2.16
14" Round
2950
1.07
2.11
16" Round
3800
1.40
2.18
24 x 16
7250
2.60
2.06
