Pub. No. 18-HE17D7-4
3
Installer’s Guide
Entering Air Side-
Single Row of
Mounting Holes
On Flange
Discharge Air Side-
Double Mounting
Holes On Flange
1 Inch
Pre-Filter
Guides
Cell Guide
Key
Air Flow
Direction Arrow
Air Flow
Figure 3. Air flow
Direction
SIDE MOUNT - (Upflow model furnace only)
(14” and 17.5” Air Cleaner Cabinet Height)
NOTE: The 21" and 24 1/2" Air Cleaner Cabinet Heights
require a transition between the air cleaner cabinet and
furnace.
NOTE: Do not install the air cleaner cabinet on the side of an
air handler.
1.Rotate the four quarter turn latches on the power door
inward to remove the power door from the cabinet (see
Fig. 4) and set it aside. Remove the collecting cells and
pre-filter, and set aside until the cabinet is installed.
2.Lay the furnace on a protective pad on the floor with the
surface on which the air cleaner cabinet will be installed
in the up position.
NOTE:
This allows maximum downward force to be
exerted on the power drill when installing the attaching
screws.
3.Align the rear of the air cleaner cabinet flush with the rear
of the furnace. Align the bottom of the air cleaner cabi-
net1/4 inch above the bottom of the furnace. Mark the
inside opening of the air cleaner cabinet using the inside
edge of the mounting flange as a guide. Move the cabinet
and cut the opening.
NOTE:
Do NOT use the standard furnace indents for the
opening. The opening for the air cleaner must be larger than
the standard furnace opening.
4.Install the self-adhesive gasket material onto the flange of
the discharge-air side of the air cleaner cabinet. This
flange has double holes (see Fig. 5).
IMPORTANT: The gasket material provides a seal between
the cabinet and the furnace. It should be placed toward the
inside edge of the flange. The inner edge screw holes on the
cabinet flange will be used to attach the air cleaner cabinet
to the furnace.
Use inner
mounting holes
for Side
Installation
Figure 5. Side Installation Details
Install gasket material
toward inner edge.
Cut to length required.
Bottom MOUNT - Furnaces or Air
Handler
1.Rotate the four quarter turn latches on the power door
inward to remove the power door from the cabinet and set
it aside. Remove the collecting cells and pre-filter and set
aside until the cabinet is installed.
2.Position the furnace/air handler on a protective pad on the
floor with the bottom of the furnace/air handler in the up
position (see Fig. 6).
NOTE:
This allows maximum downward force to be
exerted on the power drill when installing the attaching
screws.
3.Install the self-adhesive gasket material onto the flange of
the discharge-air side of the air cleaner cabinet. This
flange has double holes (see Fig. 8).
IMPORTANT: The gasket material will provide a seal between
the cabinet and the bottom of the unit. It should be placed
toward the outside edge of the flange. The outer edge screw
holes on the cabinet flange must be used to attach the air
cleaner.
4.Position the air cleaner cabinet on the bottom of the unit
with the gasket against the unit. Align the rear of the
cabinet with the rear of the unit and the two sides of the
cabinet with the sides of the unit. The front of the cabinet
will NOT align flush with the front of the unit.
Open
Position
Closed
Position
Figure 4. Power Door
5.Position the air cleaner cabinet, with the gasket against the
furnace, over the furnace cabinet opening cut previously
in step 3.
6.Check that the front of the air cleaner cabinet is facing the
front of the furnace.
7.Securely attach the air cleaner cabinet to the furnace using
the heavy-duty self-tapping sheet metal screws provided.
8.Seal all joints in the return air system to prevent dust from
entering the airstream.
NOTE: Do NOT use a silicon base sealant. This causes a
coating on the ionizing wires that will decrease the efficiency
of the Air Cleaner.
9.Reinstall the pre-filter, collecting cells and power door.
