Allowable Leakage based on DW/143 Duct Pressure Class

System (or section) Surface Area:
Test Pressure:
DW/143 Pressure Class:
Allowable leakage (L/s) based on your input is:
Leakage Factor based on your input is:
L/s per sq.meter
Calculate Leakage Allowed

Calculations based on the DW/143 guide published by the Building & Engineering Services Association, Sixth Edition. We assume no liability for use of this program. We have made every effort available to make sure this program calculates correctly, and it is up to the user to verify the calculations are correct.