WINCHESTER
BY
MORTEX
PRODUCTS
INC
FORT
WORTH,
TX
76106
Page
5
Figure 4: Typical Alcove Installations
Figure 5: Clearance – Access for Service
Air Distribution System
The furnace is designed to operate at a 0.30 inch WC static
pressure. In order to assure proper air flow through the furnace
the duct distribution system must be designed so that the
external static pressure from the furnace, thru the duct system
must not exceed 0.30 inch WC. It is recommended you review
the manual
“Manufactured Housing Duct Systems Guide to
Best Practices”
by Manufactured Housing Research Alliance
(MHI-MHRA)
before selecting the air distribution system
you are going to use.
SECTION IV: SUPPLY AIR AND DUCT
CONNECTOR INSTALLATION
Duct Connectors
90-DCU0-XX Duct Connectors
The duct connector is used to provide a sealed connection
between the furnace base and an under the floor duct system.
The duct connector allows the furnace to be installed on a
combustible floor without the use of a separate sub base
providing insulation is placed between the duct connector and
the combustible floor. Table 5 indicates the duct connector
needed for your application.
DEPTH
FROM
FLOOR
TO
DUCT
FINGERED
STYLE
1"
90
‐
DCU0
‐
01
2"
90
‐
DCU0
‐
01
3"
90
‐
DCU0
‐
01
4"
90
‐
DCU0
‐
01
5"
90
‐
DCU0
‐
02
6"
90
‐
DCU0
‐
02
7"
90
‐
DCU0
‐
02
8"
90
‐
DCU0
‐
02
9"
90
‐
DCU0
‐
03
10"
90
‐
DCU0
‐
03
11"
90
‐
DCU0
‐
03
12"
90
‐
DCU0
‐
03
Table 5: Duct Connectors
Figure 6: Duct Connector Depths
Installing the Duct Connector
1.
Attach the four (seal strip) foam tape gaskets provided
with the duct connector alongside the perimeter of the
duct opening to seal the duct connector where it attaches
to the top of the duct as shown in Figures 7, 8 and 9.
2.
Insert the duct connector thru the opening in the floor and
attach the duct connector to the top of the duct by
inserting the tabs thru the opening in the top of the duct
and bending the tabs back 90 degrees against the inside of
the duct, so the top of the duct is securely fastened to the
duct connector. Be sure the seal strip has sealed the area
around the duct connector where it attaches to the duct.
3.
Slit the corners of the duct connector that extend above
the floor, and then bend the sides over onto the floor
surface. Refer to Figures 7, 8 and 9.
4.
Place insulation with a rating of R-12 or higher between
the floor base and the floor when used on a combustible
Duct connector can be installed on combustible flooring,
except carpeting
, providing insulation having a rating of
R-12 or higher is used between the floor base and the
combustible floor.
Failure to use insulation with a rating of R-12 or higher
between the floor base and a combustible floor; then
installing the floor base on a combustible floor could result
in serious injury, death, or property damage.
A fire may result causing property damage, personal injury
or loss of life.
