OO-B-2925 - OO-B-2925, FEDERAL SPECIFICATION: BAGHOUSE, REVERSE PULSE JET; FOR PACKAGED BOILERS FIRED ON COAL OR A COMBINATION OF COAL AND GAS, COAL AND OIL, OR COAL-GAS-OIL (2,000,000 TO 125,000,000 BTU/HR THERMAL OUTPUT CAPACITY) (16 MAY 1997) [SUPERSEDING MIL