00797nam a2200265 4500 11267 11267 INP 20260622100029.0 180627b1991 us aj||fr 00| 0 eng|d 90-49387 0133886530 EG-INP ara EG-INP 21 697.07 b h .Langley, Billy C. High-Efficiency gas furnace troubleshooting handbook / Billy C.Langley. New jersey : Prentice-hall, Inc, 1991. 264 p. : ill. ; 24 cm. Includes Index. Furnaces Maintenance and repair. Air conditioning Equipment and supp;ies Maintenance and repair. Gas appliances. 1431 EGPV20 EGPV20 original 0 INP INP BK