Suburban's SFQ series furnaces provide maximum heating performance in a ducted unit, and come with an amazing list of features: SF-30QT is a new model to rectify parts shortages BRAND NEW----FACTORY WARRANTY Capacities of 20,000 BTU's, 25,000 BTU's, 30,000 BTU's, 35,000 BTU's, and 40,000 BTU's Only 7-1/2” high, they can be installed in areas that might be left unused Nine (9) duct connection choices (top, front, side and bottom). Choice of models for either inside installation or installation from the outside SF Models feature top, or side rear gas connections, and optional exterior service access door SF-F Models are designed for interior installation and serviceability All SF models have Identical cabinet dimensions, and feature quiet stainless steel burners, sealed forced-draft combustion, automatic direct spark ignition, and low amp draw DIMENSIONS: H= 7-1/2", X W= 17", X D= 20"