# VENTS-US 4 in. Galvanized Back-Draft Damper with Rubber Seal

**Brand:** [VENTS-US](https://shop.coreranger.com/brands/VENTS-US)
**SKU:** KOM 100 U
**Price:** $19 · in stock
**URL:** https://shop.coreranger.com/product/vents-us-4-in-galvanized-back-draft-damper-with-rubber-seal-205715168

## Specifications

| Spec | Value |
|---|---|
| Gauge | 26 |
| Model # | KOM 100 U |
| Material | Galvanized Steel |
| Duct Type | 4" Round |
| Pack Size | 1 |
| Internet # | 205715168 |
| Returnable | 90-Day |
| Store SKU # | 1001199648 |
| Product Depth (in.) | 4 in |
| Product Width (in.) | 3.88 in |
| Product Length (in.) | 3.88 in |
| Certifications and Listings | No Certifications or Listings |

## Description

The KOM 100 U is a 4 in. round spring-loaded back-draft damper that helps keep outside air out of the ventilation system. When the fan runs, airflow pushes the blades open. When it stops, the spring closes them automatically, and the rubber seal helps minimize air leakage while the damper is closed. The durable galvanized steel body is rated for operating temperatures up to 212°F. Its insert-style design fits directly into standard 4 in. round duct. Use it for general exhaust ventilation, including bathroom exhaust, kitchen exhaust, utility rooms, and mechanical rooms.

• Helps prevent backdraft in bathroom, kitchen and exhaust ducts
• Sealed closure helps reduce drafts when the fan is off
• Insert-style body slides into existing 4 in. round duct