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8
PRODUCT DESIGN
Thermostats:
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
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 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
BOTTOM RETURNSIDE RETURN
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.
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.
FURNACE INPUT FILTER SIZE
40M
32 0 in
2
60M
48 3 in
2
80M 640 in
2
10 0M
80 0 in
2
12 0M
73 8 in
2
14 0M
73 8 in
2
DISPOSABLE NOMINAL 300 F.M. FACE VELOCITY
MINIMUM FILTER SIZES for DISPOSABLE FILTERS
Thermostat Man/Auto Programmable Cool Heat Batt. Powered Batt. Bkup
1213406*
Man. Or Auto Yes 2 3 No No
1213407
Man. Changeover Yes 2 2 Yes Yes
1213411
Man. Changeover No 2 2 Yes No
THERMOSTATS
*1213406 is the recommended model for the G*S* furnaces when used with a heat pump in a fossil fuel application.
It is NOT for use with the G*S8 as a sole heating source. 1213406 thermstats are 24V powered with battery
backup.