Extractor Fan - How to fix ducting to a wall

[BigBev]

Hello All

It's my 1st post on this forum but in the past I have read many useful tips here so I hope someone can offer some advice.

I have a new downstairs loo which is vented into the garage. Obviously, need to vent it to the outside so we're looking to fix some flexible ducting from the cloakroom end of the garage to the outside wall. My question is, how should we fix the ducting to the wall? It will (eventually ) be boxed in but any bright ideas on how to fix along the wall would be great.

Thanks for any help!!

Bev

 

[Taylortwocities]

Use flat channel duct like this
http://www.screwfix.com/p/manrose-rectangular-flat-channel-1000mm/14118

There's fixing clips and adaptors and bends. See teh website.

 

[holmslaw]

..

 

[RMS]

Use screw eyes and tie wraps, you can also get screw in bases for tie wraps. View media item 38397

That would look a mess. The simple solution would be a solid duct.

 

[Taylortwocities]

Use screw eyes and tie wraps, you can also get screw in bases for tie wraps. View media item 38397

That would look a mess. The simple solution would be a solid duct.

I agree, it would be a total horlicks. Maybe OK if it is to be boxed in, or if you live in a grass hut, like Holmslaw.

 

[holmslaw]

..

 

[RMS]

Use screw eyes and tie wraps, you can also get screw in bases for tie wraps. View media item 38397

That would look a mess. The simple solution would be a solid duct.

Its going to be boxed in!! Your "simple solution" is an unnecessary and pointless expense.

Really?

Depending on the length of the run there may be problem with condensation build up in the duct. Byusing solid duct you can angle it with a slight fall towards the outside. This would allow condensation water build up to run outside. This would not be achievable with flexi duct. The extra cost wont break the bank.

 

[Taylortwocities]

OK OK.
If its to be boxed in, and if you must use 100mm flexi duct then use these to provide support at regular spacing.
http://www.screwfix.com/p/floplast-sp82-pipe-clips-black-pack-of-5/76037

Even so, I stand by my suggestion for Flat Channel Ducting.
If fitted properly then boxing in should not be necessary.

 

[OwainDIYer]

if it's breaking through a garage wall (fire compartment?) would an intumescent collar be necessary or advisable?

 

[bernardgreen]

Condensation will happen inside the pipe where it passes through the cold garage and be trapped in the folds of the flexible duct. It can then create a smelly mess in the duct. When the fan is not running the colder heavier air at the end of the duct will push the smell backwards into the warmer lighter air in the toilet room.

Corrogated flexible duct also creates turbulant air flow wihich increases resistance to air flow in the duct reducing the amount of air that is extracted from the toilet room

Use 100 mm drainage pipe and bends with, as mentioned, a slope down the exit into free air.

Use brackets like this to secure the pipe. http://www.drainageonline.co.uk/110mm-Push-fit-Soil/110mm-Double-Fix-Soil-Pipe-Clip.htm

 

[ban-all-sheds]

Plan B?

 

[Taylortwocities]

We havent heard from Bev for a while? So we do not know if any of our suggestions have been taken on board.

One thing to note is that many of the cheaper loo fans are not very powerful and will have trouble pushing air more than about 3metres up a duct.
How long is the duct ?



(Bernard, my 110mm pipe clips are half the price of yours )

 

[bernardgreen]

(Bernard, my 110mm pipe clips are half the price of yours )

I took the first that Google offered. I could probably find them a lot cheaper somewhere. I note Ban did not offer a link for the source of nasal sensory inhibitors. One per family member and extraction would not be needed.

 

[ban-all-sheds]

You could get the plastic ones, and match the colour to your tie (or undies).

 

[bernardgreen]

Plastic pegs are as bad as downlighters.

Sorry to be dragged ( or me dragging ) off topic.

Valid point about extending the duct on a weak fan. Maybe the opportunity to fit a more powerful fan at the end of the duct. More powerful extract and much less fan noise inside the house. Less noise is a big advantange at the night when people are asleep when someone uses the toilet.

Also ensure that replacement warm air can get into the room under the door or over opening from the house as that will compensate a bit for the longer duct. If the existing duct is corrogated it might be worth replacing that with smooth walled pipe.