3.5.2 Rough-in Vent Termination
Natural Draft Installations
The following information applies to all standard, KZK, and vented
options when venting with natural draft. If using Kozy Power Vent
#KPV, please reference the manual included with the kit.
3.5.2.1 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 Natural Draft Vent Termination Clearances on
IMPORTANT - METAL FAB VENT SYSTEM:
When installing Metal Fab
vent pipe, an adapter must be used. This will increase the minimum
height for the center of the vent pipe by 3-1/4” (83mm) when
framing the wall pass through. The minimum enclosure depth will be
increased by 4” (101mm).
3.5.2.2 Clearances
•
A minimum of 1” (25mm) clearance on all sides of the vertical
vent pipe must be maintained.
•
A minimum of 1” (25mm) clearance from the top surface on the
horizontal pipe at the wall pass-through must be maintained.
•
A minimum of 1” (25mm) clearance on the sides and bottom
surfaces on the horizontal pipe at must be maintained.
3.5.2.3 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.
3.5.2.4 Horizontal Terminations
WARNING: Do not recess the vent cap into wall or siding.
IMPORTANT: Horizontal vent sections require 1/4” (6mm) rise for every
12” (305mm) of travel for natural draft applications.
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.
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 to maintain clearance
requirements.
3.5.2.5 Wall Pass Through Framing Instructions
1. Measure from floor level of the fireplace to the center of where
the vent pipe will penetrate the wall. The dimension in Figure 3.6
is used with a Simpson DuraVent elbow.
2. Cut and frame an opening in the wall to allow the vent system to
run level through the wall pass-through.
3. Follow the vent pipe manufacturer’s installation instructions for
natural draft vent installation.
•
Vent pipe dimensions are tested with listed Simpson Duravent
pipe. Other manufacturers product dimensions may vary.
22”
(559mm)
34
7⁄8
”
(886mm)
Natural gas and propane
Natural Draft mininum horizontal termination
Figure 3.6, Vent Termination Framing Dimensions
ALL DESIGN OPTIONS INSTALLATION
Nominal 2”x 4” framing used in enclosure framing
16
FRAMING
Hussong Mfg. Co., Inc. • Kozy Heat Fireplaces
#CLW-40 R.3 November 2021
