TY - RPRT TI - Recommended testing and calculation procedures for determining the seasonal performance of residential central furnaces and boilers AU - Kelly, George E AU - Chi, Joseph AU - Kuklewicz, Mark E PY - 1978 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 78-1543 DO - 10.6028/NBS.IR.78-1543 ER -