Section 3-2: Installing A Roof Mounted Direct Vent Termination For 4''/7'' (Mvtk-1); Section 3-2-1: Venting Layout - Montigo H34DF Installation & Maintenance Manual

Section 3-2: Installing a Roof Mounted Direct Vent
Termination for 4''/7'' (MVTK-1)
This section applies to installations where the direct vent termination
will be roof mounted.

Section 3-2-1: Venting Layout

Selection of components and details of venting lay out should adhere
to the following guidelines:
• 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.
• Termination location must be a minimum 6' from a mechanical air inlet.
• For a more detailed diagram of allowed termination locations, see
Appendix A.
• A maximum of two offsets (each offset is made up of 2-90° bends)
may be made for vertical vent runs.
• Firestops must be installed as required by National & local codes.
• Ensure all horizontal runs are supported with a minimum of 3
supports per 10' of venting.
• Install all roof flashing and storm collars as shown.
Roof mounted terminations
The following details are some possible configurations for roof mounted
terminations. See below.
MVTK1 Termination
Roof flashing
32' max
Figure 6. Top vent, roof mounted termination with no offset in vent run.
XG0146 - 180405
Storm collar 2' min
Support ring
Support plate
Firestop
Installation
MVTK1 Termination
Storm collar
Roof flashing
32' max
Obstacle
Figure 6.b Top vent, roof mounted with 1 offset (1 offset= two 90° bends).
MVTK1 Termination
Storm collar
Roof flashing
32' max
Obstacle
2' Offset
Figure 6.c Top vent, roof mounted with 2 offsets (1 offset= two 90° bends).
2' min
Support ring
Support plate
2' Offset
Firestop
2' min
Support straps OR
Support ring and plates
Firestop
2' Offset
Support ring and plates
Firestop
Firestop
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