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VENTING
18. When condensation may be a problem, the venting system
shall not terminate over public walkways or over an area
where condensation or vapor could create a nuisance or
hazard or could be detrimental to the operation of regulator
relief openings or other equipment.
19. In cold ambient conditions, such as Canada, the following
items are recommended for proper operation and
equipment life:
• The vent pipe must not pass through an unheated space
or interior part of an open chimney unless the vent pipe is
insulated.
• Where the vent pipe may be exposed to extreme cold, or
come into contact with snow or ice, the entire vent must
be insulated or double wall (includes outdoors). It is
preferred that the double wall vent is one continuous
piece but a joint is allowed outside the building.
• The heater system shall be checked at least once a year
by a qualified service technician.
Additional Requirements for Horizontally Vented
Category III Units (Model Digit 3=P units only)
1 Seal all seams and joints of ungasketed single wall pipe with
a metallic tape or silastic suitable for temperatures up to
350°F. (3M aluminum foil tapes 433 or 363 are acceptable.)
Wrap tape two full turns around the vent pipe. Category III
vent systems listed by a nationally recognized agency and
matching the diameters specified may be used. Different
brands of vent materials may not be intermixed.
2. Refer to Table 7.1 for total minimum and maximum vent
lengths making the vent system as straight as possible.
The equivalent length of a 90° elbow is 5 feet for 4" diameter
and 7 feet for 6" diameter.
Table 7.1 - Horizontal Category III Vent Sizing
Requirements
Vent Connector
Model Size
Diameter
75
4"
4"
100-175
6"
200
225
6"
250-300
6"
350-400
6"
j Unit can be vented with 5" diameter pipe if a 6" to 5" reducer is used.
Otherwise, use 6" pipe.
3. The vent terminal must be Modine part number:
• 5H072285-0001 (Item Code 27866) for 4" vent pipe
• 5H072285-0004 (Item Code 27867) for 5" vent pipe
• 5H072285-0002 (Item Code 27868) for 6" vent pipe
4. The vent must extend a minimum of 12" beyond the exterior
wall surface and must be supported as shown in Figure 7.1.
Precautions must be taken to prevent degradation of building
materials by flue products.
5. The vent system shall terminate at least 3 feet above any
forced air inlet (except direct vent units) located within 10 feet,
and at least 4 feet below, 4 feet horizontally from, or 1 foot
above any door, window, or gravity air inlet into any building.
The bottom of the vent terminal shall be located above the
snow line or at least 1 foot above grade; whichever is greater.
When located adjacent to public walkways the vent system
shall terminate not less than 7 feet above grade.
Minimum Vent
Maximum
Pipe Diameter
Vent Length
4"
48'
4"
55'
5" j
70'
6"
70'
6"
63'
6"
70'
6. The venting system must be exclusive to a single unit, and
no other unit is allowed to be vented into it.
7. Horizontally vented units must use single wall vent pipe
although one continuous section of double wall vent pipe
may be used with the vent system. Under no circumstances
should two sections of double wall vent pipe be joined
together within one vent system due to the inability to verify
complete seal of inner pipes.
Figure 7.1 - Model Digit 3=P Horizontal Venting
USE LISTED THIMBLE
THROUGH WALL
MODEL
(SLOPE PIPE DOWN
DIGIT 3=P
1/4" PER FOOT
TOWARD DRIP LEG)
TEE WITH DRIP LEG
AND CLEANOUT CAP
5-564.4
SPECIFIED
12" MIN
TERMINAL
9" MIN
9" MIN
STEEL ANGLE
VENT TERMINATION
SUPPORT BRACKET
(WHERE REQUIRED)
7
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