Loft Ventilation - Can Someone Propose a "Solution" 6 February at 11:51AM in In my home (includes DIY) MoneySaving 15 replies 449 views

Apodemus

Lorian said:

No. The primary goals is to keep the vent pipe as short as possible and insulated.

Lorian said:

Fan in the ceiling wont push much air at all that distance on a corrugated pipe 

Yes, but if there was a good reason to site the two on opposite sides of the roof, the solution might be to simply swap the two pipes over, so that the inlet is the longer of the two in the corrugated pipe and the exhaust in the smooth, direct pipe.

grumbler

Apodemus said:

Lorian said:

No. The primary goals is to keep the vent pipe as short as possible and insulated.

Lorian said:

Fan in the ceiling wont push much air at all that distance on a corrugated pipe 

Yes, but if there was a good reason to site the two on opposite sides of the roof, the solution might be to simply swap the two pipes over, so that the inlet is the longer of the two in the corrugated pipe and the exhaust in the smooth, direct pipe.

How do you know that it's an inlet?  It can be a stack pipe vent, even more prone to condensation.

Apodemus

grumbler said:

Apodemus said:

Lorian said:

No. The primary goals is to keep the vent pipe as short as possible and insulated.

Lorian said:

Fan in the ceiling wont push much air at all that distance on a corrugated pipe 

Yes, but if there was a good reason to site the two on opposite sides of the roof, the solution might be to simply swap the two pipes over, so that the inlet is the longer of the two in the corrugated pipe and the exhaust in the smooth, direct pipe.

How do you know that it's an inlet?  It can be a stack pipe vent, even more prone to condensation.

Hence the "might".  At present we are all in the dark about what these pipes are actually doing, which is why I led with the question on whether there was a good reason for them being on opposite sides of the roof. 

grumbler

And if it's really a stack vent, I don't understand why they do this instead of just fitting an air admittance valve.

ic

A centrifugal fan would be needed to be any use on that length of duct.  I really hope its not the vent of a soil pipe - I expect the brown pipe is just a bit of off-cut used by the electrician for a ceiling fan.