How to Fix a Noisy Vent Hood Damper

Add-on dampers stop the noise

A pair of spring-loaded dampers almost always stop the damper clanging in a kitchen range hood vent cap.

By the DIY experts of The Family Handyman Magazine

Stop vent clanging with dampers

Often a stiff wind will open vent dampers, causing them to periodically clang shut. If the noise drives you crazy, new spring-loaded backdraft dampers ($9 to $30, depending on the size) should solve the problem. Measure the diameter of the vent pipe and order the dampers from a duct supply company (hvacquick.com is one source). Start by replacing the backdraft damper directly above the vent hood. If that doesn't solve the problem, install a second damper near the wall or roof discharge cap. The second damper will greatly reduce the clanging problem.

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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

  • Tape measure
  • Hacksaw
  • 4-in-1 screwdriver

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

  • Backdraft dampers
  • Small sheet metal screws