How to feed a duct through tight roof space?

[pat83]

Hey I am planning to put an inline fan with 2 intake ducts for our bathroom as we have a shower with double shower heads and the one fan isn't doing the exhausting enough steam from the second half of the room when the second shower head is running

Then I want to exhaust it all.out.the nearby eave

Question is, what would be the easiest way to feed through a 150mm duct from a edge ceiling or eave as they always have extremely low ceiling cavity at that spot

I need to have a duct go from the eave to the fan motor that I'll.place nearby in the ceiling which I should be able to reach if I commando crawl to it 

Is there a trick or technique to feed ducting through those shallow ceilings areas?

I was thinking I could attach possibly 2.yellow tongue rods and tape those.to.the duct and feed it up.from the eave hole first and far ad I can go with it 

Then go into the ceiling and connect it to the fan

[AlanM52]

Hello @pat83,

Yellow tongue is not a bad idea, I use electrical conduit to run cables through tight ceiling spaces and also to come back inside from the eave for CCTV cables. In your case in the ceiling shove the ducting as far as you can towards the eave, then go up on the roof and slide a roof tile open to check location of duct. If needed slide open other tiles and when you are directly above drag the duct some more towards the edge - repeat if needed.

Cheers

[pat83]

Would be good and easy if I had tiles but I got a color bond tin roof 😭

[JacobZ]

Hi @pat83,

I think taping a Poly Cable Feeder to the end of the duct is probably the way to go.

You could also flatten out the end of the duct, tape it so it stays flat, then pull it through. The flattened end will get through, and the rest will just follow along, compressing down as it needs to.

Starting at the eave is also probably the way to go. Get the hard bit out of the way first.

Let us know how you go.

Jacob

[R4addZ]

Hi @pat83

How big is the opening at the eaves? The issue is that if you start at the eaves, the whole length will have to be compressed and may not spring back which will affect the amount of air you can move through it. It may be better to fit a vent chimney through the roof, you will have less restriction and it will be easier to access. If the eaves are the only option head towards the eaves and compress enough to get through. You may also want to consider two sets of yellow tongues one set fixed to either side of the compressed end as this will give you more control over the duct's orentation at the critical point.