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AGA Directory American Gas Association Appliances and Listed Approved Appliances ASHVE Guide bathroom bonnet output burner—not burning forced calculated heat loss capacity Chief Underwriter closures operable Commercial Standard labeled comply Connectors crawl space Design and Installation Directory of Approved electrical Equipped with fan exceed feet filters flue forced warm air gas-fired grate area Gravity Warm Air gross output hand-fired Heat Output heat transmission hot water I-B-R Installation Guide I. B. R. M. I-B-R Installation input less Listed Accessories listed by AGA listed by Underwriters located maximum NFPA Pamphlet Oil Burners outlets percent Perimeter piping rated output Rating Code Ratio inch return inlet Return Plenum secondary heating surface shutoff valve smokepipes Space Heaters supply duct supply plenum surface to grate t. u. per hour Thermal Insulation total heating surface transmission coefficient Underwriters Laboratories vapor barrier warm air furnace warm air furnace-burner Warm Air Heating water heaters water heating