Bathroom Extractor Fan Question

[T1berious]

Hi,

I'm hoping one of you fine gents will be able to answer a daft question? What size is the average bathroom extractor fan? The reason I ask is we're having a new bathroom fitted but in there haste, the builder covered over the hole for the extractor fan.

Foolishly, I ordered a 150mm Extractor to replace the one that is buried at the bottom of the skip but have no idea how big the hole is (as it's covered up at present) or the size of the old one (it's buried in a skip).

I guess I just want someone to say for the Average size bathroom it would be a 150mm

Cheers,

T1b

[Gingerbread Man]

Typically 100mm

[T1berious]

Bugger, It would be much easier to just order the right part than open up the hole to take a 150mm?

[Neil - YVM]

Yep, typically 100mm.
But a 150mm would flow a lot more air.

[Gingerbread Man]

Depends on your ducting though.

[T1berious]

The bathroom is being changed into a wet room. So I looked at the flow rate rather than the size (I am a tool) for a replacement and the Manrose 150mm looked pretty biblical on its water rate (230 m3 p/h!).

Is it worth getting the builder that's there to widen the hole to 150mm?

Cheers,

T1b

edited - I ordered the ducting kit for the 150mm unit.

Edited by T1berious on Monday 5th September 09:45

[Harry Flashman]

Yes it is. We used 150mm fans for both wet rooms in the new house, and got the builder to core drill the old fan outlets - takes minutes.

I used Xpelair Silent 6s in both. Flow rate not as good as an inline, but should do the job perfectly well, having used the same fan in the shower room in my flat.

Make sure you have an air gap under the door to allow airflow, and have the fan on the wall opposite the door for a similar reason.

[marcusgrant]

^won't take minutes if you have an old Victorian house, took over an hour to core a hole for our fan! very hard work

[Harry Flashman]

I have a 30's house with solid brick walls, and the flat is in an 1862-built Victorian house. Diamond tipped core drill did the job in both cases in minutes!

[Bristol spark]

Harry Flashman said:

I have a 30's house with solid brick walls, and the flat is in an 1862-built Victorian house. Diamond tipped core drill did the job in both cases in minutes!

Try a stone walled property and your minuets will soon turn into hours!!


Ive spent half a day "coring" a 4" hole in a 800CM stone external wall before. As soon as you get part way a st load of rubble falls into your hole, clear it all, more falls and jams the drill, finally get the drill out and a st load more falls, repeat many times and finally you get there!! (or give up and get a builder to bosh a big hole and make good around)

[Shoegrip]

It's a job you only do once and for a wet room, you need good rates of extraction. Even if the hole is 100mm, at that size, you will have to run a high speed to get good extraction.

[Harry Flashman]

Bristol spark said:

Try a stone walled property and your minuets will soon turn into hours!!


Ive spent half a day "coring" a 4" hole in a 800CM stone external wall before. As soon as you get part way a st load of rubble falls into your hole, clear it all, more falls and jams the drill, finally get the drill out and a st load more falls, repeat many times and finally you get there!! (or give up and get a builder to bosh a big hole and make good around)

Ouch!

Dynamite?