Key Features

• Built-in Backdraft Damper – Gravity-assisted flapper opens for exhaust and closes to block drafts, rain, and pests.
• Removable Pest Guard – 1/4-inch mesh screen keeps birds, rodents, and insects out; pops out for easy cleaning.
• Oversized Sealing Flange – 10.5 in x 10.5 in base allows full shingle overlap and roofing cement seal.
• Heavy-Gauge Galvanized Steel – Withstands hail, snow loads, and UV exposure better than plastic or thin aluminum.
• Corrosion-Resistant Coating – Hot-dipped galvanized finish protects in coastal or high-moisture areas.
• Universal Roof Pitch – Works on pitches from 3/12 to 12/12.
• 4-Inch Duct Compatibility – Fits standard 4-inch round duct (inner diameter) for bathroom, kitchen, and attic exhaust.
• Safety Note for Dryer Use – Remove the bird screen when venting a clothes dryer to prevent lint buildup.

Technical Specifications

Installation Overview

Cut a 4-1/4-inch hole, slide the stem into the duct from the attic, seal the flange with roofing cement, nail in place, and overlap shingles on the top and sides while leaving the bottom edge exposed for drainage. Confirm the damper moves freely after installation.

Use Cases

Ideal for terminating bathroom exhaust fans, range hoods, and attic ventilation ducts through asphalt or composition roofs. The galvanized steel construction offers long-term durability in residential roofing applications.