A.O. Smith BTH 120-250(A) Installation & Operating Instructions Manual page 7

DO NOT TERMINATE EXHAUST
OVER PUBLIC AREA WHERE
CONDENSATE OR VAPOR CAN
CAUSE NUISANCE OR HAZARD.
DIRECT VENT
FIGURE 5
HORIZONTAL VENT
FIGURE 6
7
*NOTE: BTH 250 USES TEE ON
AIR INTAKE TERMINAL
ON DIRECT VENT INSTALLATIONS, EXHAUST VENT
HOOD MUST BE LOCATED 1' (30.5cm) MINIMUM
FROM ANY OPENING IN BUILDING.
ON DIRECT VENT INSTALLATIONS, EXHAUST VENT
HOOD MUST BE LOCATED 4' (122cm) MINIMUM
FROM ANY OPENING IN BUILDING.