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Ventilation In Line Backdraught Shutter for 4 Inch, 100mm Ducting

Product Description

IN-LINE BACKDRAUGHT SHUTTER

The 4 inch In Line Backdraught Shutter for 100mm Ducting prevents cold air entering the duct system and room. It is commonly used with inline mixed flow fans but may be used in conjunction with any 4 inch centrifugal or axial fan too.

Length of product: 61mm x 100mm

Specifications

Brand
National Ventilation
Product Code
NVT MONV303

Customer reviews

(1 Customer reviews)
Write A Review
5 Stars
100%
4 Stars
0%
3 Stars
0%
2 Stars
0%
1 Stars
0%

Simple and effective backdraft shutter. Verified Purchase

This can go in various places in the duct line. I put it just before it exits the building to stop any cold air coming into the duct. Other put it just after the fan. Horses for courses.

David Turpin | Simple and effective | October 2025

Excellent product

When I renewed my bathroom shower extractor I bought one of these and it is well worth the money if only for not hearing the 'flaps' in my old style grille flapping up and down in the wind. A good product I think although I've fitted it in such a way it's pretty easy for me to pop up in the loft once in a blue moon to check it's still moving very easily because if it starts to get 'sticky' it wont be doing the fan motor any good

alan | retford | March 2024

IN-LINE BACKDRAUGHT SHUTTER

The 4 inch In Line Backdraught Shutter for 100mm Ducting prevents cold air entering the duct system and room. It is commonly used with inline mixed flow fans but may be used in conjunction with any 4 inch centrifugal or axial fan too.

Length of product: 61mm x 100mm
(1 Customer reviews)
Write A Review
5 Stars
100%
4 Stars
0%
3 Stars
0%
2 Stars
0%
1 Stars
0%

Simple and effective backdraft shutter. Verified Purchase

This can go in various places in the duct line. I put it just before it exits the building to stop any cold air coming into the duct. Other put it just after the fan. Horses for courses.

David Turpin | Simple and effective | October 2025

Excellent product

When I renewed my bathroom shower extractor I bought one of these and it is well worth the money if only for not hearing the 'flaps' in my old style grille flapping up and down in the wind. A good product I think although I've fitted it in such a way it's pretty easy for me to pop up in the loft once in a blue moon to check it's still moving very easily because if it starts to get 'sticky' it wont be doing the fan motor any good

alan | retford | March 2024

Brand
National Ventilation
Product Code
NVT MONV303

1 Customer Reviews

4 Inch Inline Backdraught Shutter

Product Code NVT MONV303

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