DUCT LEAKAGE TESTING v1.0
Duct leakage reduces the air quantities at terminal points unless the total air quantity is adjusted to compensate. Leakage should be considered a transmission loss in duct systems. The farther air is conveyed the greater the loss will be. Key variables that affect the amount of leakage are;
i. Static pressure, not dynamic pressure. (The higher the pressure the more leakage will occur.)
ii. The amount of duct (the more duct the more opportunity for leakage there will be).
iii. The openings in the duct surface (the major contributors are joints and seams although access doors, rod penetrations and fastener penetrations also contribute).
iv. Workmanship (poor workmanship undermines the best construction standards).
Duck Leakage Testing should perform according at least one of following standards, but is not limited to the following;
* EN 1507:2006
* SMACNA:HVAC AIR DUCT LEAKAGE TEST MANUAL:2012
* DW 143:2013
* EUROVENT 2/2:1996
Step by step duct leakage testing;