Modine Manufacturing 215BTC260, Installation And Service Manual

6-563.7

A12.  For single wall galvanized combustion air inlet piping 

(model size 310 only), seal joints and seams with silicone 

sealant or 2 turns of metallic tape. Fasten individual 

lengths of vent together with at least 3 corrosion resistant 

sheet metal screws.

A13.  Do not install PVC pipe near high temperature sources of 

heat exceeding 140°F that could damage the pipe and 

cause hazardous leaks of products of combustion or water 

into the space. 

A14.  Avoid venting through unheated space when possible.

A15.  When the vent passes through a combustible wall or roof, 

no special clearance to combustible precautions are 

required to the materials through which the vent passes.  

Because of the low flue gas temperature, the vent is 

certified as zero clearance.

A16.  Minimum vent termination clearances must be maintained 

per Table 7.1:

7

InsTAllATIon - venTIng

A17. Do NOT vent this appliance into a masonry chimney. 

A18. Do NOT use dampers or other devices in the vent or 

combustion air pipes.

A19. The venting system must be exclusive to a single 

appliance, and no other appliance is allowed to be vented 

into it.

A20. Precautions must be taken to prevent degradation of 

building materials by flue products.

A21. To improve the ability to inspect and maintain the vent 

system, it is recommended that the vent pipe not pass 

through any unoccupied attic, inside wall, concealed 

space, or floor.

A22. Long runs of horizontal or vertical combustion air pipes 

may require insulation in very cold climates to prevent the 

buildup of condensation on the outside of the pipe where 

the pipe passes through conditioned spaces.

A23.  Vertical combustion air pipes should be fitted with a tee 

with a drip leg and a clean out cap to prevent against the 

possibility of any moisture in the combustion air pipe from 

entering the unit. The drip leg should be inspected and 

cleaned out periodically during the heating season.

A24.  In addition to following these General Instructions, specific 

instructions for Vertical and Horizontal vent systems in 

2-Pipe or Concentric Vent configurations must also be 

followed. The following outlines the differences:

  vertical vent system determination

    •   Vertical vent systems terminate vertically (up)  

(an example is shown in Figure 9.1).

    •  Determine the venting configuration as follows: 

       >  For 2 building penetrations through the roof (1 for the 

combustion air inlet pipe and 1 for the vent pipe), 

proceed to “Section B - Vertical Venting”.

      >   For a single larger building penetration through the 

roof, through which both the combustion air inlet and 

vent pipes will pass, proceed to “Section B - Vertical 

Venting”. Follow those instructions which cover the 

common requirements for both 2-Pipe and Concentric 

Vent installations. That section will direct you to 

“Section D - Horizontal and Vertical Concentric 

Venting” at the appropriate step of the installation. 

      >  For all other cases, proceed to the next section for 

Horizontal Vent System Determination. 

    Horizontal vent system determination

    •   Horizontal vent systems terminate horizontally  

      (sideways) (an example is shown in Figure 11.1).

    •  Determine the venting configuration as follows:

       >  For 2 building penetrations through the wall (1 for the 

combustion air inlet pipe and 1 for the vent pipe), 

proceed to “Section C - Horizontal Venting”.

      >  For a single larger building penetration through the 

wall, through which both the combustion air inlet and 

vent pipes will pass, proceed to “Section C - 

Horizontal Venting”. Follow those instructions which 

cover the common requirements for both 2-Pipe and 

Concentric Vent installations. That section will direct 

you to “Section D - Horizontal and Vertical Concentric 

Venting” at the appropriate step of the installation.

➀

 Do not terminate the vent directly above a gas meter or regulator.

➁

 The vent must be at least 12" higher than anticipated snow depth.

Table 7.1 - minimum vent Termination Clearances

minimum Clearances for

structure

vent Terminal location 

Forced air inlet within 10 feet 

3 feet above

Combustion air inlet of another  

appliance 

6 feet all directions

Door, window, gravity air inlet, 

4 feet horizontal and below

or any building opening 

1 foot above

Electric meter, gas meter, and 

4 feet horizontal (U.S.)

relief equipment 

➀ 

6 feet horizontal (Canada)

Gas regulator 

➀

3 feet horizontal (U.S.)

6 feet horizontal (Canada)

Adjacent public walkways 

7 feet all directions

Grade (ground level) 

3 feet above 

➁