Modine Manufacturing DFP Installation And Service Manual page 7

INSTALLATION
Figure 7.1 - Vertical Category I Vent System
X
ROOF PITCH IS:
X / 12
12
USE LISTED THIMBLE
THROUGH ROOF AND
CEILING
BACK VIEW
EXHAUST
RECOMMENDED
2' MIN
TO WALL OR ADJOINING BUILDING
TERMINAL
2' MIN*
USE THIMBLE
THROUGH
CELLING
4" MIN
EXHAUST
12" MIN
RECOMMENDED
Table 7.1 - Minimum Height from Roof to Lowest
Discharge Opening
Rise X (in) Roof Pitch
0-6 Flat to 6/12
6-7 6/12 to 7/12
7-8 7/12 to 8/12
8-9 8/12 to 9/12
9-10 9/12 to 10/12
10-11 10/12 to 11/12
11-12 11/12 to 12/12
12-14 12/12 to 14/12
14-16 14/12 to 16/12
16-18 16/12 to 18/12
18-20 18/12 to 20/12
20-21 20/12 to 21/12
➀ Size according to expected snow depth.
LISTED TERMINAL
"H" MIN*
ROOF FLASHING
4" MIN
TEE WITH DRIP LEG
AND CLEANOUT CAP
(SLOPE 1/4" PER
FOOT DOWNWARD
TOWARD DRIP LEG)
12" MIN
ROOF FLASHING
* SIZE ACCORNING
TO EXPECTED
SNOW DEPTH.
TEE WITH DRIP LEG
AND CLEANOUT CAP
(SLOPE 1/4" PER
FOOT DOWNWARD
TOWARD DRIP LEG)
Min Height H (ft) ➀
1.00
1.25
1.50
2.00
2.50
3.25
4.00
5.00
6.00
7.00
7.50
8.00
Additional Requirements for Horizontally Vented
Category III Units
1. Seal the joints with a metallic tape or silastic suitable for
temperatures up to 350°F. (3M tapes 433 or 363 are
acceptable.) Wrap tape two full turns around the vent pipe.
2. Refer to Table 7.2 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 7.2 - Horizontal Category III Vent Sizing
Requirements
Vent Connector
Model Size Diameter
75
100-175
200
225
250-300
350-400
➀ 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 a Gary Steel 1092.
4. The vent must extend a minimum of 12" beyond the exterior
wall surface as shown in Figure 7.2. The vent must be
supported as shown in Figure 7.3. 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.
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 7.2 - Horizontal Venting
GARY STEEL
MODEL 1092 TERMINAL
Figure 7.3 - Venting Through Combustible Walls
2" MIN.
VENT PIPE
DIAMETER
2" MIN.
5-564
Minimum Vent
Pipe Diameter
4" 4"
4" 4"
5" ➀
6"
6" 6"
6" 6"
6" 6"
PITCH VENT PIPE DOWNWARD
FROM UNIT 1/4" PER FOOT
12"
POWER EXHAUSTER OUTLET
Min.
TEE WITH DRIP LEG
AND CLEANOUT CAP
AT LOW POINT OF
VENT SYSTEM
METAL FIBER GLASS
SLEEVE INSULATION
MIN. 2"
12" min
METAL FACE
PLATE
1"
METAL
9"
SLEEVE
VENT TERMINATION
45 SUPPORT BRACKET
1"
9" (where required)
(Make from 1" x 1" steel angle)
Maxium Vent
Length
48'
55'
70'
70'
63'
70'
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