Joints and seams shall comply with section 603 of the nc mechanical code.
Duct blast test form.
All ducts air handlers filter boxes and building cavities used as ducts shall be sealed.
Press done after you complete the document.
Duct tightness shall be verified as follows.
Email the file for review and save a copy for future jobs.
Use this adobe pdf form for calculating allowable leakage cfm based on percent allowable input.
Cfm 25pa ring circle one if applicable.
Block if present the ventilation air duct connected to the conditioning system.
Test results rou gh in w o air handler 4 cfm final w o blower door 8 cfm rough in w air handler 6 cfm final w blower door 12 cfm date of test system test standard cfm 100 sf area served cfm 25 result pass fail 1.
If any supply or return duct chases flexible lines or air handler units are in these areas by iecc 2015 code a duct leakage test is required.
This test involves using a fan to force air into the duct system and measuring how much air leaks out through cracks and holes the registers are taped closed for the test.
Follow the support section or contact our support group in the event you ve got any questions.
Instructions click here save download the file open using adobe reader enter your orifice plate data using your calibration certificates.
Open 1 2 3 duct tester location.
The duct blaster is connected to the air handler to pressurize the taped over duct system to 25 pascals.
Pressure tap location.
A duct leakage test duct testing can be performed at rough in before.
Get and sign nc duct leakage test form pressure differential of 0 1 inches w g.
Duct air leakage test section 403 2 2 sample worksheet n1103 2 2 sealing.
This includes areas like unconditioned attics garages and crawlspaces.
Example blank form duct leakage test form customer information.
It calculates duct surface area measured system leakage rate and pass fail criteria.
25 pa across the entire system including the manufacturer s air handler enclosure.
I certify that these duct leakage rates are accurate and determined using standard duct testing protocol.
If a crawlspace is conditioned then no test is required.
A duct pressure test is not required if the air handler and all ducts are located inside the building thermal envelope.
If different from above street.
This is about the pressure that an hvac system normally experiences.
The blower door is not used for this test.