Backdraft Damper Vents | McMaster-Carr

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308 Products

Louvers

Movable-Blade Wall Louvers

These gravity-operated louvers remain open only when air flows, preventing backdrafts.

Chemical-Resistant Movable-Blade Wall Louvers

Made of PVC, these louvers stand up to acids, alkalies, salts, and corrosive vapors in harsh environments and won’t rust.

Combination Fixed- and
Movable-Blade Wall Louvers

Fixed front blades give you consistent sight lines when viewing these louvers from outside, while hidden rear blades open and close.

Roof Louvers

These louvers are gravity operated. The blades open when your roof-mounted exhaust fan goes on and close when it's off, preventing backdrafts.

Duct and Fittings

Standard Duct and Fittings

No need for clamps or connectors—duct and fittings have a male end that is slightly smaller than its female end for simple assembly.

Quick-Disconnect Duct and Fittings

Join duct and fittings with quick-release clamps for faster disassembly and cleanout than other duct systems.

Chemical-Resistant Duct and Fittings

Made of PVC plastic to withstand acids, alkalies, salts, and other corrosive vapors and fumes.

Wall/Ceiling Registers

Direct air coming out of HVAC systems. Adjust the damper to control airflow.

Dampers for Drop-Ceiling Diffusers

These dampers regulate airflow.

Airflow Dampers

Regulate airflow by adjusting dampers from fully open to fully closed.

Blast Gates

Control the flow of air and material through duct systems.

Easy-Install Blast Gates

Often added to existing systems, these gates install without disassembling duct. Also known as half gates.

Automatic Blast Gates

More convenient than other blast gates, these automatic gates open and close in sync with dust collectors, fume exhausters, and other machines.

Fire-Rated Airflow Dampers

In the event of a fire, these dampers automatically stop airflow through duct.

Automatic Airflow Dampers

Save energy and increase comfort by heating and cooling only the areas that need it.

Self-Cleaning Blast Gates

Use in dust collection systems. The slide pushes through the top of the gate to clear debris.

Furnace Draft Dampers

Also known as barometric dampers, these dampers improve furnace performance by automatically opening and closing to maintain consistent airflow despite changing environmental conditions.

HVAC Damper Actuators

Incremental and Proportional
HVAC Damper Actuators

Actuators automatically switch between incremental and proportional control to adjust dampers to regulate airflow.

Proportional HVAC Damper Actuators

These actuators provide better control than incremental actuators because they are constantly being positioned in response to duct airflow requirements.

Incremental HVAC Damper Actuators

When duct airflow varies from the setpoint, these actuators open and close until the system requirement is restored.