Historical
ANSI Z21.11.2b-2004
Addenda 2 to ANSI Z21.11.2-2002, Gas-Fired Room Heaters - Volume II, Unvented Room Heaters
Details test and examination criteria for unvented heaters for use with natural, manufactured and mixed gases, liquefied petroleum gases, and LP gas-air mixtures. Such heaters are limited to Maximum input ratings of 40,000 Btu per hour.
CSA America, Inc. [csa]