Blast Gate Dampers

The range below includes diameters from 80mm to 500mm, covering smaller workshop ducting and larger industrial ductwork sizes. Select the product that matches the diameter of your duct run, or speak to our team if you need help identifying the correct component.

Important: This information is general. Product selection and positioning depend on the design and requirements of the wider system. Speak to our team if you’re uncertain about compatibility.

Manual Blast Gate Dampers for Ductwork Systems

The products in this category are manually operated ducting dampers. Moving the blade changes the open area through the component, while the integrated thumbscrew holds it in the selected position.

They can be incorporated into:

• Express Duct clipped ducting
• Standard spiral ducting
• Flexible ducting when used with the appropriate connection component

The connection method depends on the ducting system. Express Duct installations use the relevant clipped connection, while standard ductwork may require a compatible adapter or connection section.

Product details at a glance

• Operation: Manual sliding blade with integral thumbscrew
• Connection: Express Duct clipped connection
• Available diameters: 80mm to 500mm
• Body construction up to 355mm: Die-cast aluminium alloy
• Body construction from 400mm: Galvanised steel
• Blade: Steel blade, with separate 316 stainless-steel blade options available

The exact construction varies with diameter, so check the individual product description before ordering.

Blast Gate Damper Sizes and Materials

The category includes common sizes such as 100mm, 125mm, 150mm, 200mm, 250mm and 300mm, alongside larger diameters up to 500mm. The correct size is normally selected by matching the damper diameter to the adjoining Express Duct components.

We also stock separate 316 stainless-steel blast gate damper blades. These provide another material option for compatible damper bodies, but they are sold separately from the standard products shown below.

Connecting Blast Gate Dampers to Your Ducting

The same blast gate damper body can be used across different types of ductwork, but the required connection component may vary.

For Express Duct clipped ducting, the damper can be incorporated using the matching clipped connection. For spiral or flexible ducting, separate blast gate damper adapters are available to provide a compatible connection.

If you are replacing an existing damper or working with a mixed ducting system, check the duct diameter and connection type before ordering.

Manual and Pneumatic Blast Gate Control

Manual blast gate dampers are operated directly by moving and securing the blade. We supply a separate range of pneumatic blast gate dampers, where the blade is moved using a pneumatic cylinder.

The choice between manual and pneumatic operation depends on the wider system and its controls. Browse the relevant product range or contact the team to discuss the available components.

Frequently Asked Questions

What is a blast gate damper?

A blast gate damper is a ductwork component with a sliding blade that changes the open area through a branch. It may also be described as a ducting damper, blast gate or gate damper.

How do you lock a manual blast gate into position?

The blade is moved manually and held in the selected position using the integral thumbscrew fitted to the damper.

Are stainless-steel blast gate dampers available?

The standard products shown here use steel blades. Separate 316 stainless-steel replacement blades are available for compatible blast gate damper bodies.

Are these blast gate dampers airtight when closed?

Blast gate dampers restrict or close the open area through a branch, but they may not provide a completely airtight seal.

Can a blast gate damper be cleaned?

The required cleaning method and frequency depend on the material passing through the system and the wider installation. Check the relevant product information or contact the team before carrying out maintenance.