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6-560.4

A9. When the vent passes through a combustible INTERIOR

wall or floor, a metal thimble 4" greater than the vent

diameter is necessary. If there is 6' or more of vent pipe in

the open space between the appliance and where the vent

pipe passes through the wall or floor, the thimble need

only be 2" greater than the diameter of the vent pipe. If a

thimble is not used, all combustible material must be cut

away to provide 6" of clearance. Where authorities have

jurisdiction, Type B vent may be used for the last section

of vent pipe to maintain clearance to combustibles while

passing through wall or floor (see Figure 6.1). Any material

used to close the opening must be noncombustible.

A10. All seams and joints of the single wall pipe must be sealed

with metallic tape or silastic suitable for temperatures up to

400°F. Wrap the tape 2 full turns around the vent pipe.

One continuous section of double wall vent pipe may be

used within the vent system to pass through the wall to a

listed vent cap. Refer to instruction A11 in “Section A –

General Instructions – All Units” for attaching double wall

pipe to single wall pipe.

A11. The following are General Instructions for Double Wall

(Type B) Terminal Pipe Installation:

How to attach a single wall vent terminal to

double wall (Type B) vent pipe:

1. Look for the “flow” arrow on the vent pipe.

2. Slide the vent terminal inside the exhaust end of the

double wall vent pipe.

3. Drill 3 holes through the pipe and the vent terminal.

Using 3/4" long sheet metal screws, attach the cap to

the pipe. Do not overtighten.

How to connect a single wall vent system to a

double wall (Type B) vent pipe:

1. Slide the single wall pipe inside the inner wall of the

double wall pipe.

2. Drill 3 holes through both walls of the single and double

wall vent pipes. Using 3/4" sheet metal screws, attach

the 2 pieces of pipe. Do not overtighten.

3. The gap between the single and double wall pipe must

be sealed but it is not necessary to fill the full volume of

the annular area. To seal, run a large bead of 400°F

silastic around the gap.

A12. Vent termination clearances must be maintained:

INSTALLATION - VENTING

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

Table 7.1 - Vent Termination Clearances

Table 7.3 - ANSI Unit Heater Venting Requirements

Table 7.2 - Vent Terminals

A13. Do NOT vent this appliance into a masonry chimney.

A14. Do NOT use dampers or other devices in the vent or

combustion air pipes.

A15. The venting system must be exclusive to a single

appliance and no other appliance is allowed to be vented

into it.

A16. Precautions must be taken to prevent degradation of

building materials by flue products.

A17. Single wall vent pipe must not pass through any

unoccupied attic, inside wall, concealed space, or floor.

A18. Uninsulated single wall vent pipe must not be used

outdoors for venting appliances in regions where the 99%

winter design temperature is below 32°F.

A19. The vent terminal must be:

A20. In addition to following these eneral Instructions, specific

instructions for Vertical Category I or Horizontal Category

III vent systems must also be followed. The following

outlines the differences:

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, gas 4 feet horizontal (U.S.)

regulator, and relief equipment  6 feet horizontal (Canada)

Gas regulator

3 feet horizontal (U.S.)

6 feet horizontal (Canada)

Adjoining building or parapet wall 6 feet all directions

Adjacent public walkways 7 feet all directions

Grade (ground level) 3 feet above



Vertical Category I Vent

 • Verticalventsystemsterminatevertically(up)(anexample

is shown in Figure 8.1).

 • Thehorizontalportionoftheventruncannotexceed75%

of the vertical rise (Example: If the vent height is 10', the

horizontal portion of the vent system cannot exceed 7.5').

 • Theventterminatesaminimumof5'abovethevent

connector on the unit.

 • IftheventsystemtobeinstalledmeetsALLthesecriteria

(an example is shown in Figure 8.1), proceed to "Section

B - Vertical Vent System Installation". For all other cases,

proceed to the next section for Horizontal Category III Vent

System Determination:

Horizontal Category III Vent

 • Horizontalventsystemsterminatehorizontally(sideways)

(an example is shown in Figure 9.2).

 • Aventsystemthatterminatesverticallybuthasa

horizontal run that exceeds 75% of the vertical rise is

considered horizontal.

 • HorizontalventconfigurationsareCategoryIII.Additional

requirements are covered in "Section C - Horizontal

Category III Vent System Installation".

Category Description Venting Requirements

Negative vent pressure

Non-condensing

Follow standard venting

requirements.

Negative vent pressure

Condensing

Condensate must be

drained.

III

Positive vent pressure

Non-condensing

Vent must be gas tight.

Positive vent pressure

Condensing

Vent must be liquid and

gas tight. Condensate

must be drained.

Note: Vent connectors serving Category I appliances shall not be connected

into any portion of mechanical draft systems operating under positive pressure.

Model Size Modine PN Other Listed Terminals

150-200 5H0722850001 Gary Steel 1092

250-400 5H0722850002 Gary Steel 1092

1 2 3 4 5 6 7 8 9 10 11 12 ... 19 20

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