34
Unit Installation with Vertical Termination
Galvanized pipe is desirable above the roofline
due to its higher corrosion resistance . Continue
to add pipe sections through the flashing until
the height of the vent cap meets the minimum
height requirements specified in this manual or
local codes . Note that for steep roof pitches, the
vertical height must be increased .
7 . Ensure vent is vertical and secure the base
of the flashing to the roof with roofing rails,
slide storm collar over the pipe section and
seal with a mastic .
8 . Install the vertical termination cap by twist
locking it .
!
NOTE
: Any closets or storage spaces, which
the vent passes through must be enclosed .
Roof Pitch
Minimum Vent Height
Feet
Meters
flat to 7/12
2
0 .61
over 7/12 to 8/12
2
0 .61
over 8/12 to 9/12
2
0 .61
over 9/12 to 10/12
2 ½
0 .76
over 10/12 to 11/12
3 ¼
0 .99
over 11/12 to 12/12
4
1 .22
over 12/12 to 14/12
5
1 .52
over 14/12 to 16/12
6
1 .83
over 16/12 to 18/12
7
2 .13
over 18/12 to 20/12
7 ½
2 .29
over 20/12 to 21/12
8
2 .44
A poor draft, or down drafting can result from high wind
conditions near big trees or adjoining roof lines, in these
cases . Increasing the vent height may solve the problem .
Offset
Pipe Length
Height
inches
mm
inches
mm
inches
mm
4 ¾
121
0
0
13 ¼
337
9
229
6
152
17 ½
445
11 ¼
286
9
229
19 ½
495
13 ¼
337
12
305
21 ¾
552
21 ¾
552
24
610
30 ¼
768
30 ¼
768
36
914
39
991
38
965
48
1219
47
1194
Vent
Height
See DuraVent manufacturer's guidelines for minimum
cutout dimensions or frame openings around wall
venting . Make sure clearances to combustible material
are maintained based on vent part used .
!
NOTE:
Cutout sizes vary according to the DuraVent
part number used .
Diagram 4
