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FRAMING
Hussong Mfg. Co., Inc. • Kozy Heat Fireplaces
#BAY-41-MV R.1 July 2021
3.7 Vent Termination Framing
3.7.1 Vent Termination Framing Requirements
This is a cold air transfer area. The fireplace enclosure must comply
with all clearances as outlined in this manual, and be constructed
in compliance with local building codes. Outside walls should be
insulated to prevent cold air from entering room.
Exterior vent termination location must be in compliance with
Section 6.2 Minimum Termination Clearances on page 30.
IMPORTANT - METAL FAB VENT SYSTEM:
When installing Metal
Fab vent pipe, adapter #4DDA must be used off the top or rear of the
appliance. This will increase the minimum height for the center of the
vent pipe by 3-3/4” (95mm) when framing the wall pass through. For
rear venting, the minimum depth enclosure must be increased by
3-3/4” (95mm) to keep with minimum clearance requirements
.
3.7.1.1 Clearances
•
A minimum of 1” (25mm) clearance on all sides of the vertical
vent pipe must be maintained.
•
A minimum of 1” (25mm) clearance to combustibles is required
on the top, bottom, and sides of the horizontal #700-2 flexible
vent system.
•
A minimum of 1-1/2” (38mm) top clearance and a minimum of 1”
(25mm) bottom and side clearances to combustibles is required
for horizontal rigid pipe.
3.7.2 Vertical Terminations
Follow vent pipe manufacturer’s installation instructions for vertical
terminations.
•
Attic insulation shields may be insulated using unfaced
insulation products listed as non-combustible per ASTM E 136.
3.7.3 Horizontal Terminations
IMPORTANT: Horizontal vent sections require 1/4”(6mm) rise for every
12”(305mm) of travel.
Elbows listed with approved vent systems for this appliance vary in
vertical length. Please consult the vent manufacturer’s instructions to
determine the elbow dimension used for installation. Adjust the wall
pass-through rough opening dimensions as necessary to maintain
clearance requirements.
Kozy Heat’s #700-WPT, or wall thimble products that comply with the
required
1” (25mm) top clearance
to combustibles, must be installed
for all horizontal vent runs that pass through interior or exterior
walls. These wall thimble products may be insulated using unfaced
insulation products listed as noncombustible per ASTM E 136. #700-
WPT wall thickness covers 4” (101mm) to 6½” (165mm).
3.7.3.1 Wall Pass Through Information and Framing
1. Measure from floor level of the fireplace to the center of where
the vent pipe will penetrate the wall.
Cut and frame an opening in the wall to allow the vent system to
run level through the wall pass-through.
2. Follow the vent pipe manufacturer’s installation instructions for
vent installation.
•
Rigid pipe dimensions in Figure 3.5 reflect Simpson Duravent 4”
x 6-5/8” coaxial pipe. Other manufacturers product dimensions
may vary
•
Flexible pipe framing dimensions in Figure 3.5 reflect Kozy Heat
#700-2 Series Flexible Vent System.
