Seal Hvac Ducts From Inside

I have 9 flex duct lines coming off a sheet metal trunk in my attic.

Seal hvac ducts from inside.

Our non toxic water based formula effectively seals all the holes in the air ducts and vents making sure the air goes where you need it not where you don t. I was going to get out the mastic and brush and mesh but it just seemed so much easier to use silicone caulk along the relatively tight seams. Block off registers so sealant does not enter living space. I was doing it the way i thought was right pulling the duct tape off putting hvac mastic on the supply box cylinder using a zip tie to hold that in place and then using another zip tie to hold the outer sleeve in place.

Anybody find fault w that. In a typical house however about 20 to 30 percent of the air that moves through the duct system is lost due to leaks holes and poorly connected ducts. The air handler connection to the supply and return ducts must also be blocked off to prevent sealant from fouling the mechanical equipment. A technician assembles the spray sealant injection system to seal hvac ducts from the inside.

When repairing or installing ductwork always consult an hvac professional first. If you really want to seal all of your air ducts you will need to contact a professional. Only qualified contractors should perform changes to your duct system. Hvac systems including ductwork react to extremes in temperature more than you think.

However many modern residential air duct systems are constructed of fiber glass duct board or sheet metal ducts that are lined on the inside with fiber glass duct liner. I started sealing it last year but quickly lost interest grin2. My hvac guy did not have a problem w this. That is why flex seal insulation was created specifically to deal with weather extremes that leave your hvac vulnerable to leaks and issues causing bigger problems.

In houses with forced air heating and cooling systems ducts are used to distribute conditioned air throughout the house. Duct seal on old ducts my ducts are 1960 era galvanized. Since the early 1970 s a significant increase in the use of flexible duct which generally is internally lined with plastic or some other type of material has occurred. Not any product on the market can hold up under such variables without starting to breakdown.