Outside Combustion Air; Precautions And Recommendations; Model Ak6A Combustion Air Assembly - Monessen Hearth BWBC400MHB Installation And Operating Instructions Manual

Fireplaces in
manufactured homes
must be supplied with

outside combustion air.

PRECAUTION AND RECOMMENDATIONS
1. Avoid extremely long runs and numerous turns in the flex duct leading from
the fireplace to the air inlet assembly. These conditions will increase the
resistance to the free flow of air through the flex duct.
2. Locate air inlet assembly where it will not be blocked or restricted in
any manner.
3. Never mount the combustion air inlet assembly in a garage or storage area where combustible fumes such as gasoline
might be drawn into the fireplace. Do not take combustion air from any area where combustible liquids or gases are
stored.
4. Carefully cut holes for the installation of the combustion air kit. You must maintain the structural integrity of
the home.
INSTALLATION OF
AK6A COMBUSTION AIR KIT
1. Remove the cover plate from the combustion air
inlet on left side of the fireplace.
2. Place the starting collar into the hole on the side
of the fireplace. Fasten collar in place with four
(4) sheet metal screws as specified by Figure
21.
3. Cut a 6½" diameter hole in floor leading into a
ventilated crawl space and install the air inlet
assembly. See Figure 22.
Locate the air inlet assembly
where it will not be blocked or
restricted in any manner. The
air inlet assembly must not
terminate in an attic space.
4. Use duct straps to secure flex duct to starting
collar and inlet air assembly. See Figure 22.
Note: If it is necessary to splice the flex duct,
use Model 603 duct connector and
Model FP-6-U combustion air duct.
61D0087
These fireplaces are provided with model AK6A combustion air kit (for floor
installation only) to supply outside combustion air to the fireplace.
If outside wall installation or ceiling/soffit installation is preferred, pur-
chase model AK6 combustion air kit from fireplace dealer. See Figure 10,
page 12.
Left Side of Fireplace
Figure 21 - Attaching Outside Air Starting Collar and
Insulation Ring to Left Side of Fireplace
Left Side of
Fireplace
Flex Duct
(6" Dia.)
Air Inlet
Assembly
Ventilated Crawl Space
Figure 22 - Securing Flex Duct to Starting Collar and
Inlet Air Assembly with Duct Straps
OUTSIDE COMBUSTION AIR
Maintain the structural
integrity of the
manufactured home
floor, wall, and ceiling/
roof.
Shorter End of Air
Starting Collar
Duct
Strap
Starting
Collar
Sheet
Meal
Screws
21