Extractor hood ducting

glitch

glitch

glitch

Soldato
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8 Nov 2005
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I have a lovely extractor fan for my new kitchen, but it will need new ducting to be run to the outside which means running new pipework under the floorboards in the master bedroom.

Currently I have an old, knackered external grill which I want to swap out for one of these. The ducting needs to go straight up through the kitchen ceiling, bend 90° right and then exit to the outside through the space between joists in the master bedroom, in a relatively straight line to the wall.

Should I be using flexible ducting for this or go with plastic pipe? What other bits and pieces will I need to get the job done properly?
 
As above, use rigid everywhere if you can. If you cant, use rigid everywhere except the small section where you cant.

glitch said:
Should I be using flexible ducting for this or go with plastic pipe? What other bits and pieces will I need to get the job done properly?
Click to expand...

Appropriate hole saw for the pipe size (guessing 100mm?)
SDS
Tape for joins - When using rigid or rigid-flexi I always tape the joints with Duct tape, helps it stay together and reduces the risk of leaks. It may feel a good fit now, but in a few years will it still be a good fit?
Outdoor suitable silicone for sealing up any bits that are not quite right
Spirit level - You want the pipe to outside to have a natural run off to the outside, so any moisture that gets into it (it will) runs out.
One way/self closing flap *if* the fitting for the outside doesnt have one. You dont want a draft blowing in through the vent on windy days.
 
Right then, rigid it is. I need to run 150mm ducting as the hood is a monster!

Are these a better option than the one I linked to in my original post? Or is that one with a separate anti-backdraft more sensible?
 
You can get pipe with an inner layer which is smooth but the putter is ridged. We use it for mvhr. I'd use that
 
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