Energy Code Ace - JA15.2.3 Ventilation Requirements

2025 Reference Ace

Sorry, but we couldn't find anything that matches that search.

JA15.2.3 Ventilation Requirements

The reserved pathway and penetrations through the building envelope shall meet the following requirements:

(a) If the input capacity of the gas water heating system is less than 200,000 Btu per hour, the minimum air flow rate shall be 70 CFM per 10,000 Btu per hour input of the gas or propane water heating system and the total external static pressure drop of ductwork and louvers shall not exceed 0.17 inches water column when the future heat pump water heater is installed.

(b) If the input capacity of the gas water heating system is greater than or equal to 200,000 Btu per hour, the minimum air flow rate shall be 420 CFM per 10,000 Btu per hour input of the gas or propane water heating system and the total external static pressure drop of ductwork and louvers shall not exceed 0.17 inches water column when the future heat pump water heater is installed.

This panel displays referenced content when certain links are clicked.

Energy Code Ace Privacy Policy PG&E Privacy Policy Social Media Policy

This program is funded by California utility customers and administered by Pacific Gas and Electric Company (PG&E), San Diego Gas & Electric Company (SDG&E^®), and Southern California Edison Company (SCE) under the auspices of the California Public Utilities Commission.

^© 2026 PG&E, SDG&E and SCE. All rights reserved, except that this content may be used, copied, and distributed without modification. Neither PG&E, SDG&E, nor SCE — nor any of their employees makes any warranty, express of implied; or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any data, information, method, product, policy or process disclosed in this document; or represents that its use will not infringe any privately-owned rights including, but not limited to patents, trademarks or copyrights.