Retrotec DucTester 200 Series Residential Applications - Manual (Page 31)

Page 31 of 91
©Retrotec Inc. 2015
4. Set up the gauge to display Duct Leakage Results
Read the Total Duct Leakage results directly from the gauge. On the DM-2 this is the results display
”Mode”. In order to compare duct systems in different homes/buildings, it is necessary to normalize the
leakage results for the size of the HVAC system and the size of the building. The two most common
variables used to normalize duct leakage are total HVAC flow rate and the floor area of the building.
Figure 31: Some of the most common results that can be read directly off the gauge.
4.1 Mode setup for duct testing in the US
Table 3 shows what settings will directly calculate the results required for testing compliance with the
codes adopted in the various states.
Table 3: Gauge Mode Setup for US state Codes and programs for Duct Testing
Code
2009
IECC
ENERGY
STAR
Northwest
ENERGY STAR
Homes
Title-24
Code
WA State
Code
Region:
VT GA CT DE
GA ID IL IO
MA NC NH NJ
NY OH TX
MD
USA ID MO OR WA CA WA
Pressure
Pa Pa Pa Pa Pa
Flow
CFM CFM CFM CFM CFM
(Flow) @ Pressure
@25 Pa @25 Pa @50 Pa @25 Pa @25 Pa
EqLA Off
Off Off Off Off
(EqLA) @ Pressure n/a
n/a n/a n/a n/a
EfLA, Effective Leakage
Area
Off
Off Off Off Off