Sealing off large hole in heating duct

joe71April 7, 2011

I have large hole in my heat duct, where I removed an usused feeder duct. It is about 12" x 8". What is the best way to seal this. I currently have cardboard duct-taped to it. Should I just put a piece of sheet metal over it with some duct mastic as adhesive?


Thank you for reporting this comment. Undo

A few fasteners would be a good idea.

1/4 inch long self tapping sheet metal would be fine.

    Bookmark   April 8, 2011 at 11:15AM
Thank you for reporting this comment. Undo

you don't want cardboard in this area.
go to a sheet metal shop and purchase a piece
of insulation and a piece of sheet metal sized slightly
larger than opening.
put trim the insulation to fit the sheet metal
use the 1/4" self tapping sheet metal screws to
attach well. then mastic seal.

best of luck.

    Bookmark   April 9, 2011 at 8:25PM
Sign Up to comment
More Discussions
Need help choosing an efficient HRV Air Exchanger
Hi, My house as a total area of 2300 square feet (1150*x)....
I Like the Forum Changes
IMO; this new forum setup is an improvement...
Geothermal vs Carrier Greenspeed
I am looking to replace my current Heatpump. I have...
Baseboard heater thermostats
We are looking to install (2) 120v baseboard heaters...
Any Reviews/Feedback on Daikin HVAC (Dallas)
Anyone install a Daikin HVAC system yet? We are in...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™