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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.
| Author | ANSI | 
|---|---|
| Editor | ANSI | 
| Document type | Standard | 
| Format | File | 
| Confirmation date | 2013-08-07 | 
| ICS |  						91.140.10 : Central heating systems
						 | 
| Replace |  ANSI Z 21.11.2a (2008) | 
| Year | 2013 | 
| Document history |  ANSI Z 21.11.2a (2013) | 
| Country | USA | 
| Keyword | ANSI Z 21;ANSI 21;21;ANSI Z21.11.2a-2013 |