Take the 2-minute tour ×
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

Do the joints in adjustable duct elbows need to be taped as well once they're adjusted or are they considered air-tight?

enter image description here

share|improve this question
2  
what are you ducting? exhaust air from a bath fan or some type of combustion? Makes a big difference how you deal with it. –  shirlock homes Oct 19 '12 at 10:48
    
It's a bathroom exhaust fan. –  Brad Mace Oct 19 '12 at 11:56
    
Do you mean around the 3 joints in the pictured elbow? –  Steven Oct 22 '12 at 3:03
add comment

2 Answers

up vote 7 down vote accepted

Do the joints in adjustable duct elbows need to be taped as well once they're adjusted

Yes, they do.

or are they considered air-tight?

No, they are not. Far from it, in fact.

You want to tape every seam in your ductwork, using (as Shirlock pointed out) foil tape. Each exposed seam, whether it's at a connection or part of pre-formed metal like the elbow in question, is a leak point.

enter image description here

Do NOT use Duct or Duck tape as the backing for it degrades over time, faster with heat.

Edit: Even though this is for a bathroom fan, you still want to tape. Why? Because air leakage is moisture leakage, and you do not want to be pumping moisture into your attic. In winter it will lead to frost which will lead to mold.

share|improve this answer
    
much better answer. Good job, as always. –  shirlock homes Oct 19 '12 at 12:17
add comment

If you are ducting an exhaust fan from a bathroom or range hood, I would use an adhesive backed foil tape. Don't use regular duct tape on a range vent, clothes dryer or anything with higher heat.

share|improve this answer
    
This really doesn't address the question that was asked. –  The Evil Greebo Oct 19 '12 at 11:57
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.