802.8 Through-the-Wall Vent Termination.

A mechanical draft venting system shall terminate at least four (4) feet (1219 mm) from a property line, except a public way and not less than 3 feet (914 mm) above any forced air inlet located within 10 feet (3048 mm). (See Figure 802.8)

Exceptions:

(1) This provision shall not apply to the combustion-air intake of a direct-vent appliance.

(2) This provision shall not apply to the separation of the integral outdoor-air inlet and flue gas discharge of listed outdoor appliances. [NFPA 54:12.9.1]

(3) Direct-vent appliances shall comply with sections 802.2.6 and 802.8.2

Chapter 9 INSTALLATION OF SPECIFIC APPLIANCES