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3.Duct light leak test (HVAC SYSTEM) 1.To verify whether the duct is free of the air - light test or leakage test as per code ASHRAE can be used. 2.By "SMACNA HVAC DUCT construction standards" - testing of low pressure ducts for leakage is untested. Because ducts are low pressure can be used light test to verify will be provided to access any shall be sealed with approved sealing materials. 3.Duct prepared - all openings to be closed. 4.To provide the light inside the duct access door dampers can be used 5.source of the light inside the duct can be simple lamp 100-200W, portable with protection 6.Mechanic flexible cable (30m -50m) and possibility to switch ON /OFF 7.The lights inside the room where testing to be carried out shall be switched OFF at the time of the test (Test will be conducted at night) 8.Total darkness shall be maintained at test area during the test. 9.Check at every point the light from outside shall not be visible. 10.If any defect / leak found the point shall be marked and then rectified/ sealed after finishing the test. 11.after the rectification the test to be repeated 12.Test to be done for each section of the duct. Note : Top 3 Signs of Bad Ductwork 1.Your Ducts Are Leaking. One of the most common symptoms of bad ductwork is leaks. 2.Inconsistent Room Temperatures. 3.Dusty, Low Air Quality. Thanks for your valuable support.