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At an input of 60,000 BTU’s, the GRVT800603BX Goodman low NOx gas furnace is suitable for up to a small to medium house in an average climate. The output of this furnace is 48,000 BTU’s, which is calculated by the input times the 80% efficiency rating.
With the industry standard efficiency of 80% AFUE, the GRVT800603BX Goodman low NOx gas furnace uses 80% of the fuel going into the furnace to heat your home and the remaining 20% of the fuel going into it is used up in normal furnace operations and is lost out of the flue venting. The GRVT800603BX requires metal flue venting like any 80