Modine Manufacturing PD - Venting Termination and Common Venting; Minimum Roof Height for Venting; Category II Venting Requirements; Common Venting Procedures

6
INSTALLATION
ADDITIONAL VENTING REQUIREMENTS FOR CATEGORY II
UNITS
Vent system must provide for drainage of condensate. At the low
point of the vent system, install a tee fitting with a connector and
attach flexible tubing, minimum 3/8 inch I.D., and run to a drain.
Tee fitting and associated condensate disposal system must be
periodically cleaned.
ADDITIONAL VENTING REQUIREMENTS FOR VENTING INTO
AN EXISTING MASONRY CHIMNEY OR COMMON VENT
(CATEGORY III OR IV UNITS ONLY).
1. Do not vent a Category l or ll unit into a common vent with
mechanical draft systems operating under positive pressure
(Category lll or lV units.)
2. When connecting vent to an existing chimney, do not push
vent pipe beyond internal surface of chimney.
3. When venting into a common vent, the area of the common
vent should be equal to or greater than the area of the largest
vent plus 50 percent of the area of all additional vents.
4. When venting into a common vent, the individual vents
should enter at different levels.
1/4"
Slope 1/4" to
The Foot
*Size according to expected snow depth
Drip Leg with
Cleanout Cap
Use Thimble
Through Ceiling
Roof Flashing
Listed
Terminal
10′ Min.
2′*
Min.
To wall or adjoining building
10"
Unit
Rise Roof Pitch Min Height
X (in) H (ft)*
0-6 Flat to 6/12 1.00
6-7 6/12 to 7/12 1.25
7-8 7/12 to 8/12 1.50
8-9 8/12 to 9/12 2.00
9-10 9/12 to 10/12 2.50
10-11 10/12 to 11/12 3.25
11-12 11/12 to 12/12 4.00
12-14 12/12 to 14/12 5.00
14-16 14/12 to 16/12 6.00
16-18 16/12 to 18/12 7.00
18-20 18/12 to 20/12 7.50
20-21 20/12 to 21/12 8.00
Slope 1/4" to
The Foot
Unit
Drip Leg with
Cleanout Cap
Use Thimble
Through Ceiling
H
1'0"
1/4"
x
12
Roof Pitch is x/12
Listed
Terminal
Roof
Flashing
Figure 6.2
Unit Venting (obstructed)
Figure 6.1
Unit Venting (pitched roof)
Table 6.1
Minimum Height from Roof to
Lowest Discharge Opening
* Size according to expected snow depth.