New Extractor fan in clay airbrick

[mrbg07546]

i got a clay air brick in our bathroom and want to add a extractor fan. Should I just mortar in a 100mm round pipe(flush with wall on the inside)? do I need to consider anything on the air brick outside? Maybe stop back flow wind and get outside grill?

 

[endecotp]

That will probably work; I have something similar but it's at the end of a long duct.
Sometimes the fan includes the anti-backflow shutters, which would solve that problem.

 

[noseall]

Re-hash the whole thing including the fitting of the outside gravity grille.

 

[mrbg07546]

Ok ive it duct in. And put expanding foam in.

I was planning on bonding the internal side . But realised the fan would need a fixing . I presume I can't fix into expanding foam. If I put bonding and filler on top of it can I fix into that? Or should I use strong mortar mix?

 

[endecotp]

I'd put in a piece of wood, square with a round hole in it. Or conceivably plasterboard. Fix to surrounding wall (somehow) and fill space behind, around duct, with exp foam. Screw fan to wood.

Is the internal wall tiled?

 

[mrbg07546]

No it's not tiled

 

[mrbg07546]

the "somehow" is what I need to know

 

[endecotp]

A couple of steips of wood screwed to the brick set back in the hole, then the square-with-hole-in screwed into them.

Or make the square a good fit, and add some gap filling glue.

 

[Tigercubrider]

Don't forget that the fan needs power