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What are the different types of duct leakage tests?

There are two main types of air duct leakage tests, LTO and TDL. LTO stands for leakage to outside. This type of test measures only the amount of leakage you have going into unconditioned spaces like un-insulated attics and similar areas.

How do you test for duct leaks?

Turn your HVAC system on and return to the areas where ductwork is accessible. Check the connections between each section of duct, placing your hand over the metal. If you feel air against your hand, the connection is loose and there is an air leak. A common place for leaks is the duct joints.

How is duct testing done?

Duct testing involves sealing off an entire ventilation system and then pressurizing it in order to determine how airtight it is. The technicians determine how much air pressure is escaping from the ductwork and then trace down the locations so they can repair or seal them.