TY - GEN AU - Kweller, Esher AU - Palla, Robert L C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1982-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.82-2497 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1982 TI - A test method and calculation procedure for determining annual efficiency for vented household heaters and furnace equipped with modulating-type controls: ER -