We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Galvanised steel backdraft damper, single aluminium panel, square frame 15 3/4 in wide, 4 1/2 in deep

Dayton

Dayton 3HHL5 Backdraft Damper 16 in Single Panel 4-1/2 in L x 15-3/4 in

SKU CH-WMMX-ZKJRG

Single-panel backdraft damper for 16 in square duct, aluminium blade, galvanised steel frame, 2000 fpm max velocity, 1.6 sq ft free area

  • TypeNo Flange, Horizontal or Vertical Mount
  • Prevents backdraft with spring-loaded single panel
  • Fits 16 in square duct rough opening
  • Galvanised steel frame withstands 1 in wc pressure
  • Handles air velocity up to 2000 fpm
  • Compact 4.5 in depth suits tight spaces

Fits 16 in Fan Square Duct

This Dayton backdraft damper fits a 16 in fan and a square duct opening. It is built for horizontal or vertical mounting without a flange. The single aluminium panel opens with airflow and closes by spring force when the fan stops. Condition is new.

Galvanised Steel Frame 20 Gauge

The frame is galvanised steel at 20 ga thickness and 2 in depth. Overall height and width are 15 3/4 in with a 4 1/2 in length. Free area measures 1.6 sq ft and the damper handles up to 2000 fpm at 1 in wc maximum pressure. Rough opening is a 16 in square.

Replaces Leaky or Missing Damper

Install this unit when an existing damper is damaged, missing or allows unwanted backdraft. The spring return seals the duct automatically without power. It is not suited for round ductwork or applications requiring motorised control.

Highlights

  • Prevents backdraft with spring-loaded single panel
  • Fits 16 in square duct rough opening
  • Galvanised steel frame withstands 1 in wc pressure
  • Handles air velocity up to 2000 fpm
  • Compact 4.5 in depth suits tight spaces

Specifications

BrandDAYTON
TypeNo Flange, Horizontal or Vertical Mount

Questions about this item

What air velocity does the 2000 fpm rating cap in practice?

The damper is rated for a maximum air velocity of 2000 fpm, which sets the practical limit for airflow through the 1.6 sq ft free area without exceeding design pressure.

What rough opening does the 16 in square frame need to fit?

It requires a 16 in by 16 in square rough opening, matching the 15-3/4 in overall height and width for a flush mount in horizontal or vertical orientation.

How is the spring-loaded panel installed, and what step is often missed?

Mount the galvanized steel frame in the square opening with the panel hinged for gravity or spring closure; the step often missed is ensuring the 2 in frame depth clears the duct interior so the single panel swings freely.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.