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Tests air leakage of HVAC ducts in unconditioned spaces, like attics.
Our testing monometer above shows depressurization to negative 24.6 Pascals on the left of the screen and the CFM at 153 on the right of the screen. This shows the HVAC duct system achieved proper depressurization and the rate of the air infiltration.
To locate any air leakage we pressurize the system using a dust blaster. To find out if the system meets code, a calibrated fan is used to provide CFM flow. All ducts, furnace cabinets, and related components must pass a maximum of 4 cfm per 100 square foot of living area. If we find that the systems is not in compliance with the energy code then we will work with you to assess the issues accordingly with your subcontractor or crews so they can fix the air leakage issues. If needed, we can inject fog into the duct system to assist in finding the leakage points in the duct system being tested.
Prior to the duct test we request the following processes be followed:
- Any ducts, furnace cabinets, and related components will be completely sealed airtight with duct mastic. This includes all joints and seams.
- Tape or mastic all flex duct to take off connections.
- All duct boots will be sealed to the ceiling board, wall board, or subfloor, with mastic or silicone caulk.
- Do not use the building frame for ducting.
- Have ducts tested prior to the air handler installation, if possible.
