MOUNTING
The following procedure describes a typical side installation on an existing highboy furnace (Fig. 1). Alternate
procedures are noted as appropriate. Other changes in installation procedures may be necessary to complete
your installation.
NOTE:
Before starting the installation, remove and discard the existing furnace filter (if used). Thoroughly
clean the blower compartment. If possible, power vacuum the ductwork to remove accumulated dust
in an occupied home or remove construction dirt in a new home. The media air cleaner cannot remove
dirt that has settled in the blower compartment and distribution ducts.
STEP ONE: Review the Installation Plan
Temporarily place the cabinet on the floor, oriented as it will be when installed. Insert and remove the
cartridge to make sure the plan allows adequate clearance for easy removal and replacement of the cartridge.
STEP TWO: Fasten the Cabinet to the Furnace
a. Align the cabinet with the return air opening.
b. Place blocks under the cabinet, as necessary, to make sure the unit sits securely.
c. Create an opening in the furnace to match the cabinet opening.
d. Attach the cabinet securely to the furnace. Attach the unit directly or fit a starting collar in the furnace
opening. Either drill holes and fasten with sheetmetal screws or rivets, or use slip joints. If you are drilling
holes, use a locking pliers to help hold the unit in place during drilling.
STEP THREE: Install Turning Vanes
Install turning vanes to help distribute air equally over the full surface of the upstream side of the media.
Install them whenever an abrupt 90 degree elbow is installed directly against the media air cleaner cabinet.
STEP FOUR: Fasten Cabinet to Ductwork
Fasten side of cabinet to the ductwork using sheet-metal screws, rivets, or slip joints, as appropriate.
STEP FIVE: Connect Ductwork
a. Connect the vertical duct section to the elbow. If the vertical drop of the duct is less than 7 in. (178 mm)
from the side of the furnace, shorten the horizontal trunk or attach an offset fitting to the elbow.
b. When ductwork is properly aligned, connect the vertical duct to the horizontal trunk.
STEP SIX: Seal Joints
Seal all joints in the return air system between the media air filter and the furnace to prevent dust from
entering the clean airstream.
STEP SEVEN: Install Filter Cartridge
Slide the filter cartridge into the cabinet, making sure the arrow on the cartridge points in the direction of air
flow. Replace access door. Insert the tab on the bottom of the door into the slot in the cabinet. Swing the door
closed and press it into place.
Mounting the Media Air Cleaner
Media Air Cleaner 68-0239EF—13
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