1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULApril 25, 20161UL 1382Outline of Investigation for Sheet Metal Air Ducts with Sealed JointsISSUE NO: 1April 25, 2016Summary of TopicsThis is the first issue of the Outline of Investigation for Sh
2、eet Metal AirDucts with Sealed Joints, UL 1382.Sheet metal air ducts with sealed joints covered by these requirementsare intended to comply with SMACNA HVAC Duct Construction Standards Metal and Flexible, 3rd edition, 2005.The duct sealants covered by these requirements are intended to beapplied in
3、a factory and are intended to seal transverse Pi ()x8x(180) / 144) = 31.4 sq.ft.The recalculated allowable leakage would be 5.6 cfm4. Determine the correlation between leakage rates and measured pressure differentialreadings based on the measurement equipment used.For Example - an orifice tube used
4、to measure pressure drop employs the calibration equation:Leakage (CFM)=Ax(pressure drop reading) to the power of BWhereA=14andB=0.4929So, when the measured pressure drop is 0.2, Leakage is 6.3.5. For this example, the measured leakage 6.3 is greater than the required leakage of 5.6, sothe leakage value is not compliant with SMACNA Class 4.APRIL 25, 2016 UL 1382 A1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAPRIL 25, 2016UL 1382A2No Text on This Page
