TY - GEN AU - George E Kelly AU - Mark E Kuklewicz C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1981-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.80-2110 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1981 TI - Recommended testing and calculation procedures for estimating the seasonal performance of residential condensing furnaces and boilers: ER -