Back-draught shutter | damper | for ductwork | ventilation systems | D150 | plastic | 150AV

Technical Specifications

Product type: duct backdraft damper / airflow flap valve
Purpose: protection against reverse airflow
Suitable systems: ventilation, air extraction and ventilation systems
Duct type: round duct
Installation diameter: D150 / 150 mm
Outer diameter: 150 mm
Overall depth: 10 mm
Material: ABS plastic
Color: white
Mechanism: spring-loaded
Operating principle: allows airflow in one direction and blocks reverse flow
Installation location: air ducts, ventilation channels, fans, air extraction systems
Model / code: 150AV

Functions

Protection against reverse airflow – prevents air from flowing back into the room through the duct or ventilation channel.
Odor blocking – helps reduce the transfer of odors from common ventilation shafts, ducts or adjacent rooms.
One-way airflow – ensures that air is exhausted only in the intended direction.
Tight closing – the spring-loaded mechanism helps the damper close when there is no airflow.
Protection against cold air ingress – may help reduce cold air returning through the ventilation channel.
Maintains ventilation system efficiency – helps prevent improper air circulation caused by pressure changes within the system.
Easy installation – designed for standard 150 mm round ducts and ventilation components.
Lightweight construction – the plastic housing does not add significant load to the duct or fan connection.

Applications

For homeowners: Suitable for bathrooms, kitchens, toilets and storage rooms where protection from odors, cold air and reverse airflow through ventilation channels is required.

For electricians / installers: A convenient solution when installing or upgrading D150 ventilation systems, connecting fans, ducts or air extraction components.

For engineers / designers: Useful when designing ventilation systems requiring one-way airflow and reduced risk of reverse air movement.

For builders / finishing specialists: Relevant for installing ventilation openings in new construction or renovation projects where a simple and compact airflow blocking solution is needed.

For commercial property owners: Suitable for offices, sanitary areas, utility rooms and small technical rooms where maintaining better air quality and preventing odor return is important.

Advantages

Protects against reverse airflow – helps maintain proper airflow direction within the ventilation system.
Reduces unpleasant odors entering the room – useful in bathrooms, kitchens and shared ventilation shaft systems.
Spring-loaded mechanism – helps the damper close even when airflow is weak or the system is not operating.
Helps improve indoor comfort – reduces the risk of odors, cold air and unwanted air circulation.
Easy installation – no complicated tools or special maintenance required.

Disadvantages

Suitable only for 150 mm diameter systems – adapters or a different size valve are required for other duct diameters.
Not suitable for very high temperatures or aggressive environments – ABS plastic is intended for standard ventilation conditions.

Frequently Asked Questions

What is a duct backdraft damper used for?

A backdraft damper is designed to protect a room from reverse airflow through a ventilation channel. It allows air to move in one direction and closes when airflow stops.

Is this valve suitable for a bathroom?

Yes, this valve is suitable for bathrooms, toilets, kitchens and other rooms using an air extraction system. It helps reduce the return of odors and cold air.

Can it be installed together with a fan?

Yes, the valve can be used together with a fan if the system is designed for a 150 mm duct or connection.

Does the valve completely block airflow?

The spring-loaded mechanism helps the damper close tightly when airflow is absent. However, actual sealing performance depends on installation quality, duct condition and the amount of dirt within the system.