Filter
Top Products
5
TYPICAL MOUNTING POSITIONS
Figure 8
HIGHBOY FURNACE
Installation beneath furnace.
Filter mounts horizontally,
where return air enters from
below. Raise furnace and
install beneath base.
OFFSET
AT LEAST
9 INCHES
LESS THAN
7 INCHES
Figure 9
OFFSET INSTALLATION
Typical use of duct offset to match air fi lter opening.
If duct connection to furnace allows less than nine
inches for mounting the air fi lter, shorten the lateral
trunk, or attach an offset fi tting to the elbow.
Figure 10
HORIZONTAL FURNACE
Filter is mounted vertically in the return duct
near furnace.
Figure 5
BASEMENT FURNACE
(LOWBOY)
Filter is mounted horizontally
in return plenum, just above
furnace.
Figure 6
COUNTERFLOW
FURNACE
Filter is mounted horizontally
in return duct or plenum, just
above furnace.
Figure 7
HIGHBOY FURNACE
Side installation. Filter is
mounted vertically, where
return air enters side inlet of
furnace.
AIR FLOW
AIR FLOW
AIR FLOW
AIR FLOW
AIR FLOW