Direct Venting Vertical Termination, Clearances

DIRECT VENTING: VERTICAL TERMINATION

Installation must comply with local requirements and with the National Fuel Gas Code, ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.

VENT/AIR TERMINATION LOCATIONS:

Follow these guidelines for locating the vent/air terminations:

1.Make sure the total length of piping for vent or air do not exceed the limits mentioned in Table 14 and Table 15 on

Page 36.

2.The vent must terminate at least 3 feet above the highest place in which the vent penetrates the roof and at least 2 feet above any part of a building within 10 feet horizontal.

3.The air piping must terminate in a down-turned 180° elbow, using a mesh screen, no further than 2 feet (0.6 m) from the center of the vent pipe. This placement avoids recirculation of flue products into the combustion air stream.

4.The vent piping must terminate in an up-turned rain cap as shown in Figure 35. When the vent termination uses a rain cap as illustrated in Figure 35, maintain at least 36" (914

mm)above the air inlet. The air inlet pipe and vent pipe can be located in any desired position on the roof, but must always be no further than 2 feet (0.6 m) apart and with the vent termination at least 1 foot above the air intake.

5.Locate terminations so they are not likely to be damaged by foreign objects, such as stones or balls, or subject to buildup of leaves or sediment and also not blocked or restricted by snow accumulation.

6.If installing both intake air and vent piping in a Direct Vent configuration vertically through the roof; ensure that all exterior vertical clearance requirements shown in Figure 35 are being maintained. These clearances and those cited by local and national codes must be maintained.

Note: On flat roof installations the intake air and the vent terminations must be a minimum of 24 inches (60 cm) above any parapet, vertical wall or structure within 10 feet (3 m) horizontally. See Figure 37.

Figure 36. STAINLESS STEEL AIR/VENT TERMINATION -

VERTICAL

Figure 37. VERTICAL TERMINATION - FLAT ROOF

CLEARANCES

PREPARE ROOF/WALL PENETRATIONS

1.Air pipe penetration:

Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.

2.Vent pipe penetration:

Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole with at least a 1/2 inch clearance around the vent pipe outer diameter:

• 7½ inch (178 mm) hole for 6 inch (152 mm) vent pipe

• 8½ inch (203 mm) hole for 7 inch (178 mm) vent pipe

Insert a galvanized metal thimble in the vent pipe hole (when required by local codes).

3.Space the air and vent holes to provide the minimum spacing shown in Figure 35 and Figure 36.

4.Follow all local codes for isolation of vent pipe when passing through floors, ceilings, and roofs.

5.Provide flashing and sealing boots sized for the vent pipe and air pipe.

Figure 35. PVC/CPVC AIR/VENT TERMINATION -

VERTICAL

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