Insulating ducting??

Joined
10 Apr 2012
Messages
81
Reaction score
1
Location
Yorkshire
Country
United Kingdom
Do I need to insulate the ducting coming from my extractor fan if it is fixed over the boards in my loft?

Mandy
 
Sponsored Links
Joined
17 Aug 2010
Messages
2,236
Reaction score
298
Country
United Kingdom
This is not really an electrical question, but it depends what temperature you have in the loft. If the loft is colder than the bathroom (probably true) then if you don't insulate then the moisture will condense and run back down through the fan.

There are fittings to deal with this I believe (to catch the water running down) but it is probably best to insulate the duct.
 
Joined
3 Nov 2006
Messages
26,589
Reaction score
2,813
Location
Bedfordshire
Country
United Kingdom
There are fittings to deal with this I believe (to catch the water running down) but it is probably best to insulate the duct.
Do both. The first few minutes will create condensation until the duct warms up. An un-insulated duct will cool the air inside the duct. Warm air rises and rising air in the duct helps the fan to move air. Cold air descends and works against the fan.
 
Joined
10 Apr 2012
Messages
81
Reaction score
1
Location
Yorkshire
Country
United Kingdom
Any ideas where I would get insulated ducting from?? Yeah sorry about the miss posting it was followed on from an electrical question about the fan so it did end up in the wrong category.]

Mandy
 
Joined
3 Nov 2006
Messages
26,589
Reaction score
2,813
Location
Bedfordshire
Country
United Kingdom
Ordinary ducting wrapped in a layer of fibre glass insulation and a layer of sack cloth or similar to keep the fibre glass in place seems to work very well.
 
Joined
31 Jan 2014
Messages
144
Reaction score
2
Location
West Midlands
Country
United Kingdom
As others have said, if you are extracting warm air through ducting in a cold loft space, the warm air will condense inside the pipe. So insulating it in some way would be a good idea.

I used Domus Thermal insulation for the rigid ducting in my loft space, wasn't that cheap but really easy to fit, insulates the pipe, and looks nice and tidy.
 
Joined
30 Jul 2013
Messages
507
Reaction score
44
Location
Hampshire
Country
United Kingdom
I picked up some insulated aluminium ducting from an e-bay seller, a I only needed 2 metres. I think it cost about £10 including delivery. Failing that, just tape rockwool to ducting you may already have.

Make sure the ducting is angled down towards the exit point, so any condensation can run out.
 
Sponsored Links
Top