© Copyright CalCERTS, Inc. 2019
Code Cycle: 2016 & 2019 Standards
Reference: CalCERTS New Construction Training Manual Chapter 6, Section 4
Low Leakage Air-Handling Unit
To qualify as a low leakage air-handler, a manufacturer must certify to the Energy Commission that the appliance meets the requirements in Reference Joint Appendix JA9. The requirements of JA9 do not apply to attached coil boxes, filter boxes, plenums or other duct system components that are not an integral part of the air-handling unit cabinet. Allowable leakage for qualification as a low leakage air-handling unit shall be equal to or less than 1.4 percent of the nominal air-handling unit airflow determined by JA9.2.3. This maximum leakage requirement for the air-handler is the responsibility of the manufacturer. The HERS rater must verify that the installed air-handling unit has been certified and is on the CEC’s list of certified equipment.
HERS Verification of Low Leakage Air-Handling Unit with Sealed and Tested Duct System
If a qualified low leakage air-handling unit is installed it allows the user to model a target duct leakage of less than the usual 5%, so be sure to check your CF1R for the appropriate target value. The low leakage air-handling unit cabinet (furnace, or heat pump fan and inside coil) shall conform to the qualification requirements given in Reference Joint Appendix JA9, and shall be included in the list of low leakage air handling units published by the Energy Commission. The qualified air handler must be connected to a sealed and tested new duct system to receive the credit.
In order to comply with this credit, the duct system shall be verified to leak less than or equal to the leakage rate specified on the Certificate of Compliance using the methods in Section RA220.127.116.11.1 (Duct leakage test), and the air handler manufacturer make and model number shall be verified to be a model certified to the Energy Commission as qualified for credit as a low leakage air handler.
The Low Leakage Air-Handling Unit Model identified on the CF2R-MCH-20c is included in the list of certified Low Leakage Air-Handling Units published on the Energy Commission Website at: