11
PRODUCT DESIGN
Thermostats:
It is recommended that a single-stage heat, non-power robbing thermostat be used. Refer to the product marketing
literature for a complete list of thermostats offered.
Filters:
Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or
CAN/ULCS111 standards. Installing this furnace without filters will void the unit warranty.
Refer to Minimum Filter Area tables to determine filter area requirement.
NOTE:
Filters can also be installed elsewhere in
the duct system such as a central return.
Upflow Filters
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(in
2
)
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(in
2
)
All
16 x 25 x 1
400
14
12 x 25 x 1
300
17-1/2
14 x 25 x 1
350
21
16 x 25 x 1
400
24-1/2
20 x 25 x 1
500
Side Return(s)
Bottom Return
FURNACE INPUT
FILTER SIZE
40M
320 in
2
60M
483 in
2
80M
640 in
2
100M
800 in
2
120M
738 in
2
DISPO SABLE NO MINA L 300 F.M. FACE VELOCI TY
MINIMUM FILTER SIZES for DISPOSABLE FILTERS
