5 Vertical direct venting
Prepare roof penetrations (continued)
3.Space the air and vent holes to provide the minimum spacing shown in FIG.
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.
Multiple vent/air terminations
1.When terminating multiple Knight wall mount boilers, terminate each vent/air connection as described in this manual (FIG.
WARNING Terminate all vent pipes at the same height and all air pipes at the same height to
avoid possibility of severe personal injury, death, or substantial property damage.
2.Place roof penetrations to obtain minimum clearance of 12 inches between edge of air intake elbow and adjacent vent pipe of another boiler for U.S. installations (see FIG.
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.
Figure 5-2 Vertical Terminations with Multiple Boilers
12” MINIMUM VERTICALLY 
FROM VENT OUTLET TO 
ANY AIR INLET
12” MINIMUM FROM EDGE OF AIR INTAKE PIPE TO ADJACENT VENT PIPE FROM ANOTHER BOILER
Figure 5-3 Alternate Vertical Terminations with Multiple Boilers
30 
Installation & Operation Manual
Vertical termination – optional concentric vent
Description and usage
Lochinvar offers an optional concentric combustion air and vent pipe termination kit. Both combustion air and vent pipes must attach to the termination kit. The termination kit must terminate outside the structure and must be installed as shown in FIG.
Field supplied pipe and fittings are required to complete the installation.
The required combustion air and vent pipe fittings are listed in Table 3D, on page 19 of this manual.
Vertical termination installation
1.See Section 5, Vertical Direct Venting - Determine Location (where applicable).
Figure 5-4 Concentric Vertical Termination
Figure 5-5 Do Not Install U-Bend to Rain Cap
2.Cut one (1) hole (5 inch diameter for #CVK3003 installations or 4 inch diameter for #CVK3008 installations) into the structure to install the termination kit.
3.Partially assemble the concentric vent termination kit. Clean and cement following the cleaning procedures in these instructions.
a.Cement the Y concentric fitting to the larger diameter kit pipe (see FIG.
b.Cement rain cap to the smaller diameter kit pipe (see FIG.