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Duct Air Leakage Tester Operation Manual Ver.3
7. GB Standard GB50243
Rectangle Duct pressure class
Maximum Leakage m
3
/h/m
2
Low-pressure system
0.1056 × P
.
Medium pressure system
0.0352 × P
.
High pressure system
0.0117 × P
.
P-- Working pressure(Pa) of the Duct system.
1.The allowable air leakage for the Round Metal Duct of low pressure and medium pressure, composite material
duct and Illegal orchid form of nonmetallic duct should be 50% of the regulated leakage value of the rectangle
duct.
2. The allowable air leakage of brick concrete duct should be no more than 1.5times regulated leakage value of
the rectangle duct.
3.Ventilation dedusting with low temperature air supply system should be according to and comply with the
standard for Medium pressure system; 1-5 class air cleaning system should be according to and comply with the
standard for High pressure system.
