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B| Style | Model | Flange Width | Rough Opening Length | Rough Opening Width | Overall Width | Overall Height | Damper Size | Fits Fan Dia. | Rough Opening Dia. | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 5NKN4 | 1 1/2" | 17 1/2" | 17 1/2" | 19 3/4" | 19 3/4" | 17" x 17" | 16" | 17 1/2" | £124.57 | |
| A | 5NKN5 | 1 1/2" | 20 1/2" | 20 1/2" | 22 3/4" | 22 3/4" | 20" x 20" | 20" | 20 1/2" | £130.31 | |
| A | 4HX72 | 1 1/2" | 7 1/2" | 8 1/2" | 10 3/4" | 10 3/4" | 8" x 8" | 8" | 8 1/2" | £55.08 | |
| B | 4HX73 | 1 1/2" | 10" | 10" | 12 3/4" | 12 3/4" | 10" x 10" | 10" | - | £75.07 | |
| A | 4HX74 | 1 1/2" | 11 1/2" | 12 1/2" | 14 3/4" | 14 3/4" | 12" x 12" | 12" | 12 1/2" | £82.11 | |
| A | 4HX75 | 1 1/2" | 12 1/2" | 13 1/2" | 15 3/4" | 15 3/4" | 13" x 13" | 12" | 13 1/2" | £92.95 | |
| A | 4HX77 | 1 1/2" | 14 1/2" | 15 1/2" | 17 3/4" | 17 3/4" | 15" x 15" | 12" | 15 1/2" | £102.89 | |
| A | 5NKN6 | 1 1/2" | 25 1/2" | 25 1/2" | 27 3/4" | 27 3/4" | 25" x 25" | 24" | 25 1/2" | £167.72 | |
| A | 4HX76 | 1 1/2" | 13 1/2" | 14 1/2" | 16 3/4" | 16 3/4" | 14" x 14" | 12" | 14 1/2" | £97.78 |
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.