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S. Draft diverter outlet size 3 in. With integrated adapter for 4 in. Vent option. 0.62 energy factor. Recovery at a 90 degrees rise-gallons/hours 43. First hour rating 71. 1 in. Insulation. Factory installed t p valve new advanced gas control system incorporates an internal microprocessor providing enhanced operating parameters a tighter differential for precise sensing faster heating response to optimize performance. Valve is self-powered uses a thermopile to generate the power needed to operate valve incorporates self diagnostics monitoring. Item weight – 146 lbs.