DAYTON Damper Backdrafts
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B| Style | Model | Frame Material | Free Area | Rough Opening Width | Overall Width | Rough Opening Length | Overall Height | Damper Size | Fits Fan Dia. | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 4HX73 | Aluminum | 0.4 sq. ft. | 10" | 12 3/4" | 10" | 12 3/4" | 10" x 10" | 10" | €89.37 | |
| B | 4HX74 | Aluminum | 0.7 sq. ft. | 12 1/2" | 14 3/4" | 11 1/2" | 14 3/4" | 12" x 12" | 12" | €97.72 | |
| B | 4HX75 | Aluminum | 0.9 sq. ft. | 13 1/2" | 15 3/4" | 12 1/2" | 15 3/4" | 13" x 13" | 12" | €110.62 | |
| B | 4HX76 | Aluminum | 0.9 sq. ft. | 14 1/2" | 16 3/4" | 13 1/2" | 16 3/4" | 14" x 14" | 12" | €116.35 | |
| B | 4HX77 | Aluminum | 1.2 sq. ft. | 15 1/2" | 17 3/4" | 14 1/2" | 17 3/4" | 15" x 15" | 12" | €122.42 | |
| B | 5NKN4 | Aluminum | 1.7 sq. ft. | 17 1/2" | 19 3/4" | 17 1/2" | 19 3/4" | 17" x 17" | 16" | €148.27 | |
| B | 5NKN5 | Aluminum | 2.5 sq. ft. | 20 1/2" | 22 3/4" | - | 22 3/4" | 20" x 20" | 20" | €147.16 | |
| B | 5NKN6 | Aluminum | 3.8 sq. ft. | 25 1/2" | 27 3/4" | 25 1/2" | 27 3/4" | 25" x 25" | 24" | €189.63 | |
| B | 4HX72 | Galvanized Steel | 0.3 sq. ft. | 8" | 10 3/4" | 8" | 10 3/4" | 8" x 8" | 8" | €65.55 |
Damper Backdrafts
Dayton damper backdrafts are suitable for use in ductwork, roof curbs or wall collars when using a fan or power roof ventilator. The blades of these dampers are provided with a felt seal on the leading edge for superior protection from the weather and are spring supported to permit blades to open comfortably. Choose from a range of these damper backdrafts, available in 1.375 and 1.5-inch widths.
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