Inline Extractor Fan

7 Jan 2011
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I have an standard extractor fan in my bathroom which is out through cavity.

I want to wire a new inline extractor as well to give the bathroom a bit more suction as walls and ceiling are soaking when showering.

Is it OK to just spit current extractor fan cabling and connect to inline fan so in essence the 2 fans will be running?

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If you install a second fan then the two will fight. The more powerful fan will pull air in through the weaker one so you wont get much of a benefit.
Unless you install back draft flaps.

You'd be better off investigating why the existing fan isn't being efficient.

Tell us the size, make and model of the wall fan. And the size of the bathroom. Perhaps we can suggest a better fan.

One thing that people often forget is that for a fan to be efficient, you must allow at least the same amount of air in to the room as what you are extracting. So, if you have a 4" fan, you'll need an inlet hole of at least that size somewhere to let air in. If you have tight fitting doors and windows then the fan will be trying to create a vacuum and wont work efficiently.
The current fan is the standard 4inch extractor fan that's installed (Manrose XF100S 100mm Axial Bathroom Extractor Fan White 240V).

I have got this whihc I installed in another bathroom I recently upgraded and its excellent.

The room is not air tight as window is left open on latch most of day and night due to the issue.

The room is 2.5mtrs by 1.5mtrs.
I have repeatedly been disappointed by the high noise and low quality of Manrose.

Inline fans can be much better. I am not familiar with the brand you found on Amazon, though I notice it is noisier than good brands.

A bathroom extractor works better with the door and window CLOSED and a gap under the door. The cool dry air will then stratify under the hot air and water vapour which is lighter than air and in still conditions will rise to the ceiling
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