Spring-Loaded Back Draft Damper Roof Cap
Broan-Nutone
For 3-1/4" x 10" duct or 8" round duct. Spring loaded back draft damper and bird screen. Galvanized steel. Baked enamel, black finish.
No. 634: Size: 3-1/4" x 1" Duct or 8" Round Duct, Material: Galvanized Steel, Color: Black
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