6
INSTALLATION
REMOVE OLD FILTER AND DISCARD
(Figure 11)
NOTE: This filter may be mounted in the furnace compartment.
CLEAN BLOWER COMPARTMENT
NOTE: The air filter cannot remove dirt from blower and ducts.
INSTALLATION
The following is a typical installation of the air filter on a
“Highboy” furnace (Figure 7).
1. Place the air filter compartment on the floor. Stand it upright
with the door facing you (Figure 2). If a horizontal installation
is being planned, lay the compartment on its side, this will
help you to visualize the relative location of all parts.
2. Remove the door (by grasping top and pulling door away
from compartment) and set it aside. Remove 4” filter by
grasping it at the top and bottom. Set in a safe location until
the cabinet is installed.
3. Set the compartment next to the furnace (if possible) to
match the opening in the compartment.
If the furnace opening cannot be enlarged, a transition
fitting should be used. (Figure 3).
The compartment can be attached directly (Figure 12), or a
starting collar can first be fitted to the furnace inlet. A butt or
slip joint can be used.
Securely attach the compartment to furnace inlet, using
at least two of the mounting holes on each side of the
compartment.
4. Using butt joint, attach duct work (normally an elbow) to the
upstream side of air filter compartment. (Note the use of the
sheet metal turning vanes inside the elbow to improve air
distribution.) (Figure 13)
Transition Fittings
If the air duct does not fit the compartment opening, a transition
fitting should be used. Gradual transitions are preferred for
greatest efficiency. Not more than four inches per linear foot
(approximately 20° angle) should be allowed (Figure 3).
5. Connect the vertical duct section to the elbow.Wedge a wood
block between floor and elbow for support (Figure 14).
6. Seal all joints in the return air system downstream from the
air filter with duct tape to prevent dust from entering the air
stream. Tape is usually applied on the outside of ducts, but
may also be applied on the inside, or both.
7. With the air filter compartment installed, re-install 4” filter
and door. (Figure 2)
MAINTENANCE
The fiber filter used in this cabinet for air cleaning
must be replaced every 90 to 180 days. Your heating
and cooling efficiency will decrease due to insufficient
air flow when filter becomes dirty.
CAUTION
!
For maximum efficiency, your air filter should be inspected once
a month and changed if dirt loading is heavy. When changing is
required, the following procedure should be used.
1. Remove door from air filter compartment.
2. Remove 4” filter and discard.
3. Insert new 4” filter by sliding it into the compartment.
(Note direction of air flow.)
4. Replace door.
Figure 11
Figure 12
Turning
Vanes
Air Flow
Figure 13
Vertical
Section
Wood Block
Tape All
Joints
Figure 14
Duct
Mounting
Holes
Frame
