Duct Sealant

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Duct Sealant

Current Ontario building codes require duct sealant to be applied at time of installation; unfortunately this leaves many homes with existing ductwork only partly or completely un-sealed. In a typical house, with an un-sealed duct system, about 20 to 30 percent of the air is lost due to leaks, holes, and poorly connected ducts. This will cause your system to run longer and more often than necessary, resulting in higher utility bills and difficulty keeping the house comfortable.

Un-sealed ductwork can reduce heating and cooling efficiency by up to 20%, and in some cases even spread harmful toxins throughout the home. Gas appliances such as water heaters, furnaces, and some dryers, create combustion gases, (such as carbon monoxide) as part of their regular operation. These combustion gases can be harmful if not properly vented to the outside or if un-sealed ductwork draws these gases in through gaps or holes in the return air sections. Once the duct system draws in these harmful gases, it circulates them into the home, where they can build up in areas of poor exterior ventilation (such as closets or storage areas) and create a very serious health concern.

Our technicians are specifically trained to seal all duct work to the maximum code “Level A”, beyond the minimum “Level C”. This ensures the ductwork is completely sealed and operating most efficiently, reducing energy costs and health risks.

duct seal levels

Our technicians will:
Inspect the whole duct system, including attic and crawlspaces when necessary.
Repair damaged and disconnected ducts straighten and shorten flexible ducts that are tangled or crushed.
Seal all leaks and connections with metal tape, or other approved sealant.
Insulate ducts in unconditioned areas (such as attics, crawlspaces, and garages) with duct insulation that carries an R-value of 6 or higher.
Recommend a new filter as part of any duct system improvement.

Some indicators of a poorly sealed duct system are:
High utility bills.
Rooms that are more difficult to heat or cool.
Vents with poor air flow.
Excess dust throughout the home.
Furnace room is very warm or cool depending on the thermostat setting.

duct seal levels

(Picture from energy star website)