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Page 1 of 1 9/12/2025
P.O. Box 1434, Edwards, CO 81632 | www.north39energy.com | 970.306.4237
Murillo Residence
Duct Leakage Testing Report
Test Date: September 11th, 2025
Builder: Monico Murillo
Contact: Monico Murillo
Site Address: 1127 Scutter Lane, Silt, CO
Site Visit By: Jason Weingast
Background
The project goal is to undergo testing to determine total duct leakage testing for the duct runs
that leave conditioned space per 2015/2018 IECC R403.3.4 Rough-in test. North 39 Energy was
contracted to perform the testing.
Site Observations
Construction of the building envelope was in final stage, but the duct runs leaving conditioned
space were not connected to the air handler. The duct blaster fan was installed at the return and
supply runs into the attic space. The pressure inside of the duct system was measured at the
ceiling return and supply for the upper level. The pressure inside of the duct system was
changed using the duct blaster until the pressure differential between the duct system and the
outside reached zero. At this point, the CFM25 was recorded.
Duct Blaster Test
The ducts were pressurized, utilizing the duct blaster fan testing equipment, to a pressure of 25
Pa. At the test pressure, the CFM was recorded, in order to determine the CFM per conditioned
floor area. A measurement of ≤ 3cfm/100sf of CFA is required for compliance.
The total duct leakage test resulted in the following measurements: 3.0 CFM25/ 100 Square
Feet of Conditioned Area
Please call with any questions or concerns.
Jason Weingast
HERS Rater & IECC/HERS Compliance Specialist
NORTH 39 ENERGY
Expert Energy Consulting & Verification Services