4
Sidewall direct venting
(continued)
25
Installation & Operation Manual
12" MIN. BETWEEN EDGE OF AIR
INLET AND ADJACENT VENT OUTLET
VENT / AIR
TERMINATION
VENT
AIR
Figure 4-5A Multiple Vent Terminations (must also
comply with Figure 4-1A)
All vent pipes and air inlets must terminate
at the same height to avoid possibility
of severe personal injury, death, or
substantial property damage.
Multiple vent/air terminations
1. When terminating multiple Knight wall mount boilers
terminate each vent/air connection as described in this
manual (FIG. 4-5A).
2. Place wall penetrations to obtain minimum clearance
of 12 inches between edge of air inlet and adjacent vent
outlet, as shown in FIG. 4-5A for U.S. installations. For
Canadian installations, provide clearances required by
CSA B149.1 Installation Code.
3. The air inlet of a Knight wall mount boiler is part of a
direct vent connection. It is not classified as a forced air
intake with regard to spacing from adjacent boiler vents.
WARNING
Figure 4-5B Alternate Multiple Vent Terminations w/Field
Supplied Fittings (must also comply with Figure 4-1B)
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
b. Insert a galvanized metal thimble in the vent pipe
hole as shown in FIG. 4-4C.
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.
AIR PIPING
ELBOW
BIRD SCREEN
ELBOW
BIRD SCREEN
SIDEWALL
TERMINATION PLATE
GALVANIZED
THIMBLE
VENT PIPING
Figure 4-4C Alternate Sidewall Termination Assembly
w/Field Supplied Fittings
