Sub Floor Extractor Fans?

nickgrc · Post by **nickgrc** » Sat Jul 24, 2010 10:57 pm

Hi,

Does anyone know if I can buy a kit to replace a brick or existing air brick with a vent including a low voltage fan so I can extract some of the moist musty air from within the crawl space of my home?

Thanks
N

thescruff · Post by **thescruff** » Sat Jul 24, 2010 11:05 pm

Loads of stuff available.

Do a google for air extractors. vents.

nickgrc · Post by **nickgrc** » Sat Jul 24, 2010 11:18 pm

Hi,

I tried that but the only things that looked suitable are in Australia. It seems big there for some reason.

Will keep looking but Ive just found bathroom and kitchen fans so far. I was thinking of something that was a direct replacement for an airbrick - single or double. And, low voltage - like 12V DC or something.

Any thoughts?

N

thescruff · Post by **thescruff** » Sat Jul 24, 2010 11:23 pm

The low voltage fan would be the only problem I see.

Ask this guy, he's one off our advertisers, you should get a discount if you mention UHM.

http://www.fastlec.co.uk/extractor-fan- ... -1822.html

Actually there quite a few 12v Extractor fans about.

Do a google for low voltage extractor fans.

nickgrc · Post by **nickgrc** » Sat Jul 24, 2010 11:55 pm

Something like this set up attached. Two options shown...

nickgrc · Post by **nickgrc** » Sat Jul 24, 2010 11:57 pm

thanks scruff. checking out now.

My idea any good?

ta
N

nickgrc · Post by **nickgrc** » Sun Jul 25, 2010 12:00 am

I like it but I need to drop down because of the cavity. Where would the fan go?

I think I like the idea of the fan being in the wall as when it dies, which it will at some point, I dont have to get the flooring up - I just drill and chisel it out in 15 minutes.

Am I being daft?
?

thescruff · Post by **thescruff** » Sun Jul 25, 2010 12:11 am

Ask http://www.fastlec.co.uk/ what they have. thats why here on here to answer questions.

You can always duct and have a trap in the floor, I see there's plenty of 12v fans about that would normally have a transformer.

Your plan looks good.

nickgrc · Post by **nickgrc** » Sun Jul 25, 2010 12:42 am

Will have have a look. Thanks Scruff.

N

Sparky James · Post by **Sparky James** » Sun Jul 25, 2010 1:10 am

Hows about posative pressure ventilation, if the boards are good and reasonably airtight it would give better all over air movement.

nickgrc · Post by **nickgrc** » Sun Jul 25, 2010 4:45 pm

Hi Sparky. Not sure how you mean. Do you mean like taking air from outside and pushing it into the sub floor? If so that I can see how air would get to places that a negative air pressure approach wouldn't. But my worry is all the many gaps everywhere that having a higher pressure in the sub floor would mean that the stale air is dying to get out and into the house above?
Cheers

Misskerry · Post by **Misskerry** » Thu Jul 29, 2021 3:02 pm

Nickgrc - what did you end up doing? I have a very similar problem and searching for a solution but keep getting stuck.

moderator2 · Post by **moderator2** » Thu Jul 29, 2021 3:34 pm

Misskerry, Please don't dig up 10+ year old threads. None of the people in this thread have posted for a long time. I've locked the thread.