Bathroom extractor fan in window.

Arfa__

I'm looking to move/replace our current extractor fan in bathroom, due to planned conservatory encroaching the external vent on it. We can't go for a ceiling vent, due to the joists upstairs going the wrong way, so I'm thinking of putting it into the DG window. I'm aware this is a case of just replacing the DG unit.

The current DG window, has a top opening vent, can the fan go in this pane, or is this a big no-no due to it being open-able?
Otherwise I'll pop it in the lower pane that's fixed.

How big a fan should I be going for? Bathroom is small, 2m square ish. Shower is used a lot. Current fan is a Marley 4" with a timer. Its not amazing.

Any recommendations on what fan I can get for fitting in a window?

ListysDad

First, do not fit that fan back. If a fan canot hold (slap) a piece of A4 paper against it then its not worth having.

The best route, is to fit an axial (inline) fan in the loft (dont fix it leave it lying on teh insulation otherwise you get vibration) via a grill OVER THE SHOWER. The extract from the fan can exit via the soffit, up through the roof or via a gable end. It wil be much quieter and much much more effective.

Make sure its a fan with a timer and set the timer at around 10 mins.

Arfa__

Its a downstairs bathroom, hence why joists above are a problem. Little 'uns bedroom is directly above... So, which window fan would you recommend?

ListysDad

xpelair - best all round.

Arfa__

Just had a quick scoot at the xpelair stuff, seem the business, not the cheapest. Couldn't see any bigger than 10cm, is this big enough, or should I be hunting down bigger?
Also, they mention fitting in single glazed windows only. Is fitting into a DG unit possible? Or is it pointless due to not being a sealed unit?

ListysDad

Def not cheapest but best performance/cost ratio. Will fit into DG units when units made for them. They go up to 12" so call and ask for help.