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| Item | Backdraft Damper |
|---|---|
| Action | Single Acting |
| Air Flow Direction | Vertical |
| Application | Backdraft |
| Blade Material | Aluminum |
| Blade Orientation | Parallel Blades |
| Blade Seal Material | Felt |
| Blade Type | Flat Blade |
| Bushing Material | Nylon |
| Closure Type | Gravity |
| Closure Velocity Rating | 2250 FPM |
| Counterbalanced | Yes |
| Damper Size | 27" x 27" |
| Damper Type | Static |
| Fits Fan Dia. | 24" |
| Flange Type | Rear Flange |
| Flange Width | 1" |
| For Duct Shape | Square |
| Frame Depth | 2" |
| Frame Less Flange | 27 |
| Frame Material | Galvanized Steel |
| Frame Material Thickness | 20 ga. |
|---|---|
| Free Area | 4.1 sq. ft. |
| Includes | Pre-Punched Conduit Hole Knock-Out |
| Max. Air Velocity | 2250 FPM |
| Max. Velocity | 2250 FPM |
| Maximum Ambient Temperature | 180°F |
| Maximum Pressure | 1 in. wc |
| Mounting Location | Ceiling |
| Mounting Position | Horizontal |
| Number Of Panels | 1 |
| Overall Height | 29" |
| Overall Length | 4 1/2" |
| Overall Size | 29" x 29" |
| Overall Width | 29" |
| Rough Opening Dia. | 27 1/2" |
| Rough Opening Length | 26 1/2" |
| Rough Opening Shape | Square |
| Rough Opening Width | 27 1/2" |
| Single Acting/double Acting | Single Acting |
| Switch Action | NC |
| Type | Exhaust, Roof Mount |
| Height (cm) | 73.66 |
|---|---|
| Length (cm) | 11.43 |
| Width (cm) | 73.66 |
| HS Code | 7308909590 |
|---|---|
| Country Of Origin | US |
| Weight (kg) | 4.95 |
| Style | Model | Overall Size | Max. Air Velocity | Free Area | Rough Opening Length | Rough Opening Width | Overall Width | Overall Height | Rough Opening Dia. | Price (ex. VAT) | Cart |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 4HX64 | 14" x 14" | 2000 FPM | 0.7 sq. ft. | 11 1/2" | 12 1/2" | 14" | 14" | 12 1/2" | $76.37 | |
| A | 4HX65 | 17" x 17" | 2000 FPM | 1.1 sq. ft. | 14 1/2" | 15 1/2" | 17" | 17" | 15 1/2" | $93.54 | |
| A | 4HX66 | 21" x 21" | 2000 FPM | 1.9 sq. ft. | 18 1/2" | 19 1/2" | 21" | 21" | 19 1/2" | $95.24 | |
| B | 4HX67 | 25" x 25" | 2250 FPM | 2.9 sq. ft. | 22 1/2" | 23 1/2" | 25" | 25" | 23 1/2" | $132.96 | |
| A | 4HX69 | 37" x 37" | 2250 FPM | 7.1 sq. ft. | 34 1/2" | 35 1/2" | 37" | 37" | 35 1/2" | $210.12 | |
| A | 4HX70 | 41" x 41" | 2250 FPM | 8.9 sq. ft. | 38 1/2" | 39 1/2" | 41" | 41" | 39 1/2" | $263.89 |
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