Multiple Vent/ Air Terminations - Smith XWH 150 Instruction Manual

Figure 31. Polypropylene Sidewall Termination Assembly
PREPARE WALL PENETRATIONS (ALTERNATE - FIELD
SUPPLIED OPTION)
1. Air pipe penetration:
a. 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:
a. 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:
• 4½ inch hole for 3 inch vent pipe.
• 5½ inch hole for 4 inch vent pipe.
• 7½ inch hole (191 mm) hole for 6 inch (152 mm) vent
pipe.
a. Insert a galvanized metal thimble in the vent pipe hole as
shown in Figure 32.
3. Use a sidewall termination plate as a template for correct
location of hole centers.
4. Follow all local codes for isolation of vent pipe when passing
through floors or walls.
5. Seal exterior openings thoroughly with exterior caulk.
Figure 32. A Typical Sidewall Termination Assembly -
Models 150 - 800 PVC/CPVC or Stainless Steel

MULTIPLE VENT/ AIR TERMINATIONS

1. When terminating multiple XP water heaters terminate each
vent/air connection as described in this manual (Figure 33).
All vent pipes and air inlets must terminate at the same height to
avoid possibility of severe personal injury, death, or substantial
property damage.
2. Place wall penetrations to obtain minimum clearance of 12
inches between edge of air inlet and adjacent vent outlet, as
shown in Figure 33 for U.S. installations.
3. The air inlet of a XP water heater is part of a direct vent
connection. It is not classified as a forced air intake with
regard to spacing from adjacent water heater vents.
Figure 33. Multiple Vent Terminations (must also comply
Figure 34. Alternate Multiple Vent Terminations w/Field
Supplied Fittings (must also comply with Figure 23)
27
with Figure 22)