Manufacturer | Default direction to close |
---|---|
Environmental Technologies Inc. | Clockwise |
Krueger | Counterclockwise |
Titus | Counterclockwise |
Tuttle and Bailey® | Counterclockwise |
Box duct size | Area (sq ft) | Pickup gain (sq ft) | ||||
---|---|---|---|---|---|---|
ETI with a 45 degree rotation | ETI with a 90 degree rotation | Krueger | Tuttle and bailey | Titus | ||
4 | 0.09 | 1.71 | 1.63 | 2.32 | 2.80 | 1.63 |
5 | 0.14 | 1.69 | 1.66 | 2.31 | 3.00 | 1.95 |
6 | 0.20 | 1.67 | 2.90 | 2.32 | 2.90 | 3.07 |
7 | 0.27 | n/a | n/a | 2.32 | 3.00 | 2.57 |
8 | 0.35 | 1.61 | 2.52 | 2.33 | 2.90 | 2.39 |
9 | 0.44 | n/a | n/a | 2.33 | n/a | 2.30 |
10 | 0.55 | 1.63 | 2.41 | 2.32 | 3.00 | 2.31 |
12 | 0.79 | 1.61 | 2.38 | 2.32 | 3.00 | 2.76 |
14 | 1.07 | 1.59 | 2.29 | 2.33 | 3.00 | 2.02 |
16 | 1.40 | 1.61 | 2.29 | 2.33 | 3.00 | 2.12 |
18 | n/a | 1.59 | 2.43 | n/a | 3.00 | n/a |
19 | n/a | n/a | 2.92 | n/a | n/a | n/a |
20 | 0.78 | 1.61 | n/a | n/a | n/a | 2.19 |
22 | 0.78 | 1.60 | 2.65 | 2.33 | 3.00 | 2.19 |
24 | n/a | n/a | n/a | n/a | n/a | n/a |
26 | 1.00 | n/a | n/a | n/a | n/a | 2.57 |
30 | n/a | n/a | n/a | n/a | 3.00 | n/a |
40 | 2.67 | n/a | n/a | n/a | n/a | 2.22 |