DOUBLE SIZED AIR BRICK BLACK HOLE VENTILATOR - 71,500 BTU/h K-BM720

A clever piece of equipment but does not cater for unplastered walls as the minimum size it can be reduced to is a 'plastered wail' length to longI got over the problem by angle grinding the plastic air brick in half

I like this product because it's easy to use adjusts to most walls and can always use a hacksaw if need be to trim down

Stops the wind whistling in directly through the air brick - it also stops the light coming in and reduces noise from the road a little. It only gets 4 stars as I fitted it myself and wished afterwards that I'd paid someone else to do it as it involved laying on the floor with a big hammer and a brick bolster chipping bits of brick out so the ventilator would fit.

Just the job at an amazing price

Not happy it lets in the draft

Reduced draft and noise.

great value just what I was looking for.

Great product