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The clearances for through-the-wall direct-vent terminals shall be in accordance with Table 509.8.2. The bottom of the vent terminal and the air intake shall be located not less than 12 inches (305 mm) above finished ground level. [NFPA 54:12.9.3]
TABLE 509.8.2
THROUGH-THE-WALL DIRECT-VENT TERMINATION CLEARANCES
[NFPA 54: TABLE 12.9.3]
DIRECT-VENT APPLIANCE INPUT RATING THROUGH-THE-WALL VENT TERMINAL CLEARANCE FROM ANY AIR OPENING INTO A BUILDING
(inches)
10 000 Btu/h and less 6
Greater than 10 000 Btu/h and not exceeding 50 000 Btu/h 9
Greater than 50 000 Btu/h and not exceeding 150 000 Btu/h 12
> 150 000 Btu/h In accordance with the appliance manufacturer's instructions and in no case less than the clearances specified in Section 509.8.1.
For SI Units: 1 inch = 25.4 mm, 1000 British thermal units per hour = 0.293 kW

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