Technical Information

13
PRODUCT DESIGN
Thermostats:
ComfortNet™ CTK0*** Thermostat Kit
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
Upflow Filters
Return air filters may be installated at the furnace side and/or bottom return openings. The furnace bottom return opening
and side openings will accommodate the following filter sizes depending on cabinet size:
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.
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 Opening(s) Bottom Return Opening
FURNACE INPUT FILTER SIZE
60M
768 in
2
80M
960 in
2
100M
1022 in
2
DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY
M I NIMUM FIL TER SIZES
Refer to the product marketing literature for a complete list of thermostats offered.