| Item | Universal Backdraft Damper |
| Type | No Flange, Horizontal or Vertical Mount |
| Damper Size (In.) | 27-3/4 x 27-3/4 |
| Overall Size (In.) | 27-3/4 x 27-3/4 |
| Construction Material | G-90 Galvanized Steel Frame and Aluminum Blades |
| Outside Flange (In.) | 27-3/4 x 27-3/4 |
| Includes | Pre-Punched Conduit Hole Knock-Out, Felted Edges for Quiet Operation |
| Max. Velocity (FPM) | 2,000 fpm |
| Overall Width | 27 3/4 in |
| Overall Length | 4 1/2 in |
| Overall Height | 27 3/4 in |
| Rough Opening Dims | 28 in x 28 in |
| Blade | Aluminum Blade w/ Felt Seal |
| Rough Opening Diameter | 28 in |
| Frame Depth | 2 in |
| For Duct Shape | Square |
| Damper Application | Backdraft |
| Fits Fan Diameter | 28 in |
| Maximum Air Velocity | 2000 fpm |
| Pressure Drop @ 1000 fpm (AMCA 5.2) | Not Applicable |
| Free Area | 4.9 sq ft |
| For Nominal Duct Diameter | 28 in |
| Minimum Ambient Temperature | -40 Degrees F |
| Blade Seal Material | Felt |
| Fusible Link Temperature | Not Applicable |
| ACMA Leakage Class | Not Applicable |
| Rough Opening Shape | Square |
| Mounting Position | Horizontal, Vertical |
| Seal Material | Not Applicable |
| Damper Finish | Mill Finish |
| Series | 411 |
| Counterbalanced | No |
| Blade Material | Aluminum |
| Rough Opening Length | 28 in |
| Single Acting/Double Acting | Single Acting |
| Airflow Direction | Horizontal, Vertical |
| For Fuel Type | Not Applicable |
| Overall Diameter | Not Applicable |
| Bushing Material | Nylon |
| Damper Type | Dynamic |
| Flange Width | Not Applicable |
| Closure Type | Spring |
| Frame Material | Galvanized Steel |
| Rough Opening Width | 28 in |
| Frame Less Flange | 27 3/4 |
| Blade Type | Flat Blade |
| Switch Action | Normally Closed |
| Flange Type | None |
| Maximum Ambient Temperature | 180 Degrees F |
| Opening Type | Motorized |
| Blade Orientation | Parallel Blades |
| Blade Material Thickness | 26 ga |
| Closure Velocity Rating | 2,000 fpm |
| Frame Material Thickness | 20 ga |
| Number of Panels | 1 |
| Maximum Pressure | 1 in wc |
| Country of Origin (subject to change) | United States |
| Package Quantity | 1 |
Backdraft Damper, Vert/Horiz Mtg, 27 3/4Sq, DAYTON, Mfr# 3HHL7
$94,79
Free shipping will be applied on orders over $50
27.8 In.H-W 4.5 In.L Alu Spring Bkdrft Dampr, Damper Application Backdraft, For Nominal Duct Diameter 28 in, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 27 3/4 in, Rough Opening Diameter 28 in, Rough Opening Shape Square, Fits Fan Diameter 28 in, For Duct Shape Square, Free Area 4.9 sq ft, Overall Width 27 3/4 in, Frame Material Thickness 20 ga, Overall Length 4 1/2 in, Frame Depth 2 in, Rough Opening Length 28 in, Maximum Pressure 1 in wc
9999 in stock
Must order in multiples of 1
Subtotal:
$94.79
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