Vermont Castings Intrepid INDVRBDSB Installation & Operating Manual page 21

24 in. min.
(508 mm)
(610 mm)
Discharge
Opening
Termination
Cap
Storm Collar
Roof
Flashing
Roof Pitch H (Min.) Ft.
Flat to 6/12 1.0*
Roof Pitch H (Min.) Ft.
Flat to 6/12 1.0*
Over 6/12 to 7/12 1.25*
Over 6/12 to 7/12 1.25*
Over 7/12 to 8/12 1.5*
Over 7/12 to 8/12 1.5*
Over 8/12 to 9/12 2.0*
Over 8/12 to 9/12 2.0*
Over 9/12 to 10/12 2.5
Over 9/12 to 10/12 2.5
Over 10/12 to 11/12 3.25
Over 10/12 to 11/12 3.25
* 3 ft. minimum in snow regions
* 3 Feet. Minimum in Snow Regions
Figure 3.16 - Minimum Height from Roof to Lowest Discharge
Opening
For U.S. installations: The venting system must conform
with local codes and/or the current National Fuel Gas Code,
ANSI Z223.1/NFPA 54
For Canadian installations: The venting system must
conform to the current CSA B149.1 installation code.
Options
HHT offers a complete line of component parts for both
horizontal and vertical installation. Many items are offered
in decorative black as well as galvanized finish. The
galvanized pipe and fittings may be used for concealed
locations such as attics, or spaces where corrosion is a
factor, such as above the roofline. Decorative black painted
sections are recommended for use on visible interior runs.
Snorkel Terminations are available for applications which
may require vertical rise on the building exterior.
Planning Your Installation
There are two basic types of installations:
• Horizontal Termination, Figures 3.17 & 3.18.
• Vertical Terminations, Figure 3.19
2121
Horizontal
overhang
20 in.
Vertical
wall
Lowest
X
12
Roof Pitch
is X / 12
H (min.) - Minimum height
from roof to lowest
discharge opening.
Roof Pitch H (Min.) Ft.
Over 11/12 to 12/12
Roof Pitch H (Min.) Ft.
Over 11/12 to 12/12
Over 12/12 to 14/12
Over 12/12 to 14/12
Over 14/12 to 16/12
Over 14/12 to 16/12
Over 16/12 to 18/12
Over 16/12 to 18/12
Over 18/12 to 20/12
Over 18/12 to 20/12
Over 20/12 to 21/12
Over 20/12 to 21/12
Vermont Castings • Intrepid DV-IFT Owner's Manual_R20 • 11/21
When planning your installation, it will be necessary to
select the proper length of vent pipe for your particular
requirement. For horizontal installations, check these
instructions to determine the minimum clearance from
the rear of the appliance to the wall. It is also important to
note the wall thickness. Select the amount of vertical rise
desired or required, for "vertical-to-horizontal" installations
(verify that it is within the minimum and maximum limits.
To determine the length of vent pipe required for vertical
installations, measure the distance from the appliance flue
outlet to the ceiling, the ceiling thickness, the vertical rise in
an attic or second story, and allow for sufficient vent height
above the roofline. For multi-story applications, firestops
are required at each floor/ceiling level. If an offset is needed
in the attic, additional pipe and elbows will be required.
4.0
4.0
5.0
Round Ceiling Support
5.0
/ Wall Thimble Cover
6.0
6.0
7.0
7.0
Pipe Section
7.5
7.5
8.0
8.0
Figure 3.17
90° Elbow
Pipe Section
Figure 3.18
Square Horizontal
Termination
Zero Clearance Wall Sleeve
Firestop
Square Horizontal
Termination Cap
Zero Clearance
Wall Sleeve
Firestop
ST973
simpson rear install
Pipe Section
8/07
90° Elbow
Round Ceiling
Support / Wall
Thimble Cover
3-90-30007474