A.O. Smith BTH 120-250(A) - Manual (Page 7)

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FIGURE 5
*NOTE: BTH 250 USES TEE ON
AIR INTAKE TERMINAL
DIRECT VENT
HORIZONTAL VENT
FIGURE 6
DO NOT TERMINATE EXHAUST
OVER PUBLIC AREA WHERE
CONDENSATE OR VAPOR CAN
CAUSE NUISANCE OR HAZARD.
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.