# Backdraft Damper, Vert/Horiz Mtg, 29 3/4Sq

29.75 In.H-W 4.5 In.L Aluminum Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter 30 in, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 29 3/4 in, Rough Opening Diameter 30 in, Rough Opening Shape Square, Fits Fan Diameter 30 in, For Duct Shape Square, Free Area 6 sq ft, Overall Width 29 3/4 in, Frame Material Thickness 20 ga, Overall Length 4 1/2 in, Frame Depth 2 in, Rough Opening Length 30 in, Maximum Pressure 1 in wc

graingerSKU: 3HHL8, mscSKU: , zoro\_no: G0543803, mongo\_id: 65bbe8bc22d7a989a9911538

## Details

- **Price:** 144.99 USD
- **Vendor:** Dayton
- **Type:** Backdraft Roof Dampers
- **Tags:** DESCRIPTION_UPDATE

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 144.99 USD | In stock |

## Images

- Z-1IJxfo5oy.JPG
- Z-1IJxff.JPG
- Z-1II-ff.JPG

---

> Source: [The Tools Man](https://www.thetoolsman.com/products/dayton-backdraft-damper-verthoriz-mtg-29-34sq-3hhl8)
> Updated: 2026-07-12