Gas furnaces - Energy Efficiency Regulations

Gas furnace, an automatic operating gas-fired central forced air furnace that uses propane or natural gas and has an input rate of not more than 117.23 kW (400,000 Btu/h). It does not include a furnace for a mobile home or for a recreational vehicle. 
Through-the-wall gas furnace, a gas furnace that is designed and marketed to be installed in an opening in an exterior wall that is fitted with a weatherized sleeve.

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