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Heating & Air Conditioning

Assembling Ductwork For Range Hood

13 years ago

I am running 7 inch round 26 gauge metal duct for our kitchen and assembling five 3 foot sections for a long run.

When I align all the seams I find one seam on top of another forces the walls of the mating ducts apart significantly. Would it be better rotate the mating ducts so the seams are four inches apart? I find doing this reduces the distortion of the duct walls.

In addition, I am using three #8x1/2" screws to secure the mating ducts together and sealing the joint with UL Listed metal duct tape. Should the seams that run along the length of the pipe be sealed also with tape?

Thank you for taking the time to read my post and consider my questions.

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Comments (3)

energy_rater_la
13 years ago
seal all seams, joints & junctions.
metal tape should seal well to metal duct, just
make sure that duct is clean & dry.
often metal duct has an oil residue...so clean
it off first.

I use a self tapping metal screw...makes it
easier to attach both pieces of duct together.

7" duct moves a lot of air...what cfm is
vent fan? are 90 degree ells needed
to reach area you are venting to?

best of luck.
User
13 years ago
Never mind.

This post was edited by saltcedar on Tue, Sep 24, 13 at 11:43
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sequoia_2007
Original Author
13 years ago
Thanks. I offset the seams by three inches and inserted one of the three screws securing each section between the offset seams. I used Polyken 339 to seal the sections and seams. I used CCWI-181 on the 90 degree elbow seams.

http://polyken.com.mx/Archivos%20Polyken/PDF/Industriales%20Trad/Fichas%20Tecnicas/FICHA%20TECNICA%20339.pdf

http://www.ductoutlet.com/CCWI_181_Duct_Sealant_1Gal_p/ccwi-181.htm

BTW, we will be installing a zephyr typhoon hood.

http://zephyronline.com/products/essentials_power/typhoon_under_cabinet

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