TY  - RPRT
TI  - A test method and calculation procedure for determining annual efficiency for vented household heaters and furnace equipped with modulating-type controls 
AU  - Kweller, Esher
AU  - Palla, Robert L
PY  - 1982
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 82-2497
DO  - 10.6028/NBS.IR.82-2497
ER  -