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H1
H2
V1
4"/7" Venting (For reduced D36 and D48)
Vertical Minimum V1
Horizontal Maximum H1+H2
Minimum 24'' from top of unit before attaching an elbow
5"/8" Venting (D36, D48, D72)
Vertical Minimum V1
Horizontal Maximum H1+H2
Minimum 36'' from top of unit before attaching an elbow
Figure 8.e Horizontal Termination - 2 Elbows
H2
H1
V2
V1
4"/7" Venting (For reduced D36 and D48)
Vertical Minimum V1+V2
Horizontal Maximum H1+H2
Minimum 24'' from top of unit before attaching an elbow
5"/8" Venting (D36, D48, D72)
Vertical Minimum V1+V2
Horizontal Maximum H1+H2
Minimum 36'' from top of unit before attaching an elbow
Figure 8.f Horizontal Termination - 3 Elbows
16
Horizontal Termination - 2 Elbows
Horizontal
Termination - 2
Elbows
3'
4'
5'
6'
7'
8'
2'
6'
10'
12'
15'
18'
21'
3'
4'
5'
6'
7'
8'
2'
6'
10'
12'
15'
18'
21'
Horizontal Termination - 3 Elbows
Horizontal
Termination - 3
Elbows
5'
6'
7'
8'
9'
10'
10'
12'
15'
18'
21'
24'
5'
6'
7'
8'
9'
10'
10'
12'
15'
18'
21'
24'
Section 3-2-1: Roof Venting termination
• The maximum termination point is 32' above the fireplace (NOTE:
if the maximum termination height is used, the flame pattern may
be affected).
• The Vertical termination must be a minimum 2' higher than where
the termination exits the roofing materials, (asphalt shingles, cedar
shakes, etc). This distance should be measured from the high side of
the roof slope where the flue flashing intersects the roofing materials.
(see Figures 8 to 8c).
• See Appendix A for termination locations.
9'
10'
• A maximum of two offsets (each offset is made up of 2-90° bends)
may be made for vertical vent runs.
24'
MVTK1 / PVTK1
Termination
9'
10'
24'
Storm collar
Roof flashing
Figure 6.b Top vent, Roof mounted with 1
offset (1 offset= two 90° bends).
MVTK1 / PVTK1
Termination
Storm collar
Roof flashing
Figure 6. Top vent, roof mounted termi-
nation with no offset in vent run.
Installation
• Firestops must be installed
as required by National &
local codes.
• Ensure all horizontal runs are
2' min
supported with a minimum of
3 supports per 10' of venting.
Support straps
• Install all roof flashing and
OR Support ring
storm collars as shown.
and plates
Firestop
32' Max.
MVTK1 / PVTK1
Termination
Storm collar
Roof flashing
2' min
Support straps
OR Support ring
and plates
Firestop
32' Max.
32' Max.
Figure 6.c Top vent, Roof mounted with 2
offsets (1 offset= two 90° bends).
MEXT/
PEXT
MXT-10 /
PEXT-10
Adaptor
Flue
Collar
2' min
Support straps
OR Support ring
and plates
Firestop
Support ring
and plates
XG0222
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