bathroom extractor fan backdraught flaps

[Carl]

Bought a "low noise extractor fan" from Wickes today, and installed it in the corner of the ceiling of our en-suite (approx 4'x6', no windows) to replace the one that was broken. It was a bit of a pig to do as the cables in the ceiling weren't very long and by necessity there was no lighting in there.

The fan is this one:

the pamphlet in detail afterwards, it appears I should have removed the backdraught flaps when installing in a ceiling location, which I haven't done. Will there be enough air flow to keep the flaps open, as obviously the air will be fighting against gravity which wouldn't be the case in a wall installation? Otherwise I'll have to take the lot down and start again :(

[Lobster]

Well as you've installed it, surely just suck-it-and-see?

Since the installation instructions specifically counsel removing the flaps for ceiling installation, it doesn't sound great though, does it?

David

[Carl]

Surely the question is whether it will actually suck it though?

Indeed, but I'm hoping they were written for a higher gravity environment.

[Nick Leverton]

In my experience, stuff usually sucks ...

Nick

[Brian Gaff]

I guess in this instance, its blow it and see?

Brian

[MuddyMike]

Test how well it is extracting with a sheet of paper. If it will hold a sheet of paper against the inlet it is extracting air.

Mike

[Carl]

Nice tip. I tried this and it worked, so I guess I won't worry about the flaps.