International comfort products H8UH5050B12C2 Installation Instructions Manual page 21

Figure 20
Optional Duct Standoff
Optional Filter Rack Installation: Side Return
Center the filter rack on the side panel, flush with the bottom edge of
the furnace. Mark the fastening holes. Drill the fastening holes in
the side panel and fasten the filter rack in place with sheet metal
screws. See Figure 21 and Figure 22.
Side Return Filter Rack
Figure 21
Filter Rack End
cap
Filter
Filters Installed on Two Sides
Figure 22
Using Two
Filter Racks
Filter
441 01 5003 01
20 x 25 Optional
Filter Rack
Filter
(1 in = 25.4 mm)
25--23--05--1a
25--23--05--3
Filter
Specifications are subject to change without notice
Internal Filter in Bottom- Return Installation
When installing a bottom--mounted filter inside the furnace, install
the filter clips on the edge of the bottom duct opening with the wider
end of the clips toward the blower, as shown in Figure 23. Clips
may be obtained from your distributor or fabricated from sheet
metal (Figure 24). Insert filter into side clips first and push filter
back until it is fully engaged into back clip.
Figure 23 Bottom Mounted Filter
Center clip
side--to--side
9"
(23 cm)
Figure 24 Filter Clip Construction
1
1 /
"
2
(38 mm)
26 Ga. Galvanized Steel
FAST part number 1008482
NOTE: If filters are only suitable for heating application, advise
homeowner that filter size may need to be increased if air
conditioning is added.
Filter Rack with Flanges Downward:
Position the rack with the duct flanges downward so that they
extend below the furnace to attach to ductwork.
The supply duct work should have 90° flanges at the connection
end. Screw the duct to the rack flange and not to the furnace bottom.
(Screws in the furnace bottom could lift or penetrate the filter rack to
displace and distort the rack or interfere with filter removal and
insertion in the rack.) The 90° duct flange will prevent the duct from
being pushed into the furnace and lifting the rack, which would
cause a duct air leak. Seal the duct flanges to the furnace.
See Figure 28.
25--24--18--1
3"
(76 mm)
1
1 /
"
4
(32 mm)
11
/
"
16
(17 mm)
21