Historical
ANSI Z21.11.2a-2003
Gas-Fired Room Heaters, Volume II, Unvented Room Heaters, First Addenda
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]