Hood fan condensation issues

[B.Spilner]

Builder wanted to bring the cabinet company in to start to see what's happening behind the scenes, I guess?

Told them to wrap the pipe and try that before you get into demo. Pipe is wrapped, cold weather coming in wed/Thurs this week so should know if the problem is solved.

[KRyn]

@B.Spilner how did things work out for you regarding this issue? In the midst of installing a hood fan and wondering how crazy I should go with the insulation.

[jeffh]

‘No need’ is bullcrap. Alberta Building Code says to have first 3m from exterior termination to interior on an exhaust vent to be thermally insulated with at least 1” thick insulation. I’d suggest 2” or double wrapping it with 1” for that entire little bit of hard pipe. Lazy idiots.

[suntan]

This quote is hidden because you are ignoring this member. Show Quote

@B.Spilner how did things work out for you regarding this issue? In the midst of installing a hood fan and wondering how crazy I should go with the insulation.

As crazy as possible.

[zieg]

Damn, I wish I saw this when it was fresh. For what it's worth anyone in this situation should also make sure the air path is not obstructed on the inside. I had an issue with a bathroom fan dripping on really cold days, everything was insulated and seemed fine on the outside. Then I realized the dumbasses who installed the fan used screws to attach the duct, and put one in too close to the backdraft flap inside the fan housing. It severely reduced the airflow. I fixed that like 8 years ago and it never happened again.

[Twin_Cam_Turbo]

This quote is hidden because you are ignoring this member. Show Quote

Damn, I wish I saw this when it was fresh. For what it's worth anyone in this situation should also make sure the air path is not obstructed on the inside. I had an issue with a bathroom fan dripping on really cold days, everything was insulated and seemed fine on the outside. Then I realized the dumbasses who installed the fan used screws to attach the duct, and put one in too close to the backdraft flap inside the fan housing. It severely reduced the airflow. I fixed that like 8 years ago and it never happened again.

Good to know, I had issues in -30 with both my bathroom fan and my range fan last winter.

[littledan]

Check your fresh air intake for obstruction. If you starve your furnace of fresh make up air then it will pull a vacuum and any orifice in your house will start sucking more than a kardashian

[KRyn]

This quote is hidden because you are ignoring this member. Show Quote

‘No need’ is bullcrap. Alberta Building Code says to have first 3m from exterior termination to interior on an exhaust vent to be thermally insulated with at least 1” thick insulation. I’d suggest 2” or double wrapping it with 1” for that entire little bit of hard pipe. Lazy idiots.

This quote is hidden because you are ignoring this member. Show Quote

As crazy as possible.

Noted, I will go real crazy and at least double wrap it.

[suntan]

Dry fit the pieces first. Then use aluminum tape or mastic to seal the pieces. Then attach and seal those pieces. Don't mastic to the fan. Then duct wrap as much as you can. It also helps to keep the fan noise down.