Retrotec DucTester 341 - Manual (Page 38)

Page 38 of 83
©Retrotec Inc. 2014
Figure 28: Method #1 Duct Leakage to Outdoors, under depressurization
14. If the Blower Door pressure reading fluctuates more than 2 Pa, press [Time Avg] and increase the
time averaging to reduce it. If still above 2 Pa, use the Baseline feature as outlined in the DM-2
QuickGuide or DM-2 Operations Manual.
15. Press [@] on the DucTester gauge to display the duct leakage result "@25Pa".
16. Record “Flow” on the DucTester gauge which represents Duct Leakage to Outdoors
If your test requires 50 Pa, substitute 50 for 25 in all instructions.
Figure 29: Method #1 Duct Leakage to Outdoors, under pressurization
8.2.2. Method #2: Set duct to house pressure to 0 Pa (using DucTester gauge)
Method 2 does not require connecting a red tube from the DucTester gauge to outdoors, but will result
in huge errors if
[@] is turned on. If your standard requires 50 Pa, substitute 50 for 25 in all instructions.
17. Complete the previous Total Duct Leakage test.
18. Ensure all doors and windows are still closed and exhaust fans are still off.
19. Connect the Blower Door per diagram in Figure 30 (depressurization) or Figure 31 (pressurization).