Duct Sealing

The heating and cooling industry is constantly adapting to changes, the equipment is getting more and more efficient but the systems have not always kept up to the equipment. Case in point is duct work. It wasn’t until the energy code hit the HVAC market here in 1992 that we started to take the sealing of ductwork seriously and even then it was more on commercial projects rather than residentialy.

Sealed Duct

Sealed Duct

The new codes coming are getting a lot more serious about duct sealing and proving that it is sealed by pressurizing the system. Im not a big fan of making it mandatory because of the added cost to the consumer, especially in the change out market. But never the less these codes are coming.

Duct sealed

Duct sealed

I typically seal the over lapping joints with duct tape then go back and seal all the fitting joints with Hardcast Duct Seal Its very easy to apply but does take some time and can be very messy.

Duct Sealed

Duct Sealed

I really enjoy running hard pipe versus flexible duct, flexible duct is 6 times more restrictive and rodents can get into them. But flexible duct is labor friendly, is already insulated and you don’t have to worry about sealing all those joints.

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4 comments

August 2, 2010 at 7:14 am

Sealed ducts make air conditioners and heaters so much more efficient to run.

Jacob the Asheville Heating and Cooling Nerd said:

August 12, 2010 at 12:38 am

I’m not a big fan of mandatory either, but we must admit that it will do a better job

Purple Fox said:

February 9, 2011 at 2:42 am

Interesting post, I’ve had personal experience which taught me that it’s well worth getting the right materials for the job! Our ducts were sealed with some kind of all purpose Sealing Tape, which was obviously not made for this reason and meant it was a sloppy job. Got the right stuff (and someone who knew what they were doing!) and found it worked much better.

Kate said:

July 25, 2011 at 6:17 pm

What you said is true. We really need our air conditioners and furnaces sealed. Duct sealing is as important as air duct cleaning as well.

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