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Tens of millions of units have been installed in the U.S. since 1980. |
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Outstanding safety record per Consumer Product Safety Commission data. |
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49 states permit installation — with California being the only state that does not allow vent-free use. |
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National Fuel Gas Code/NFPA 54 ANSI Z223.1 permitted use since 1980. UMC accepted vent-free appliances as of January 2006. All major building and mechanical codes, including the ICC-IMC, allow the use of Vent-Free gas appliances. |
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Air volume requirements for combustion identical to vented products per NFPA 54. |
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Scientific IAQ Research confirms that products perform well below recognized IAQ guidelines. |
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Required ODS/Oxygen Detection Safety- Pilot equivalent to electric circuit breaker. |
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Safety features include automatic gas valve, internal regulator, precision burners, and piezo-igniter. |
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100% compliance of U.S. products listed to ANSI Z21.11.2 standard since 1980. Fixed installation plumbed to fuel supply enhances safety. |
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All manufacturers recommend use as supplemental heat except during power outage. Homes equipped with a vent-free unit are allowed to use these units as auxiliary heat during emergency situations. |
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