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Single Wall Furnace models
may be equipped with a
Rear Register Kit and Grille
(40542) allowing warm air
to circulate into the adjoin-
ing room. Adjustable vent
controls air flow.
ROUGH IN
Easy installation method reduces installation time to
minutes . . . only one man needed. New positive fastening
tabs hold grille in place . . . makes installation a snap!
Resettable Blocked Flue
Safety Device automatically
shuts the unit off in the
event of flue blockage or
incorrect vent installation.
Continuous Seam-Welded
Combustion Chamber
constructed of heavy gauge
aluminized steel, maximizes
heat transfer. Warranted for
ten (10) years.
Free Standing Kit (FSK)
allows single wall furnaces
to be surface mounted.
Eliminates cutting holes in
wall — ideal for masonry
wall installation. For use
with ceilings up to 8'6" tall;
adds 4-3/4" to unit depth.
(vent pipe not included).
Weight: 16 lbs.
Fan accessory kit (WFF81)
available for installation on
top of furnace to increase
circulation. Adds only 10
1
/2
”
to height of casing. Fits
flush against wall — not
recessed. Operates at
50 CFM on 115V.
Optional Night Setback
Thermostat (XL 110 / XL411)
provides economic as well
as convenient operation.
W251 Bulb Nat. 25,000 4" 1/2" 16
1
/2" W ✕ 68" H ✕ 6
1
/2" D 90 lbs. 40542 5 lbs. WFF81 10 lbs.
W255 M. Volt Nat. 25,000 4" 1/2" 16
1
/
2
" W ✕ 68" H ✕ 6
1
/
2
" D 90 lbs. 40542 5 lbs. WFF81 10 lbs.
W252 Bulb L.P. 25,000 4" 1/2" 16
1
/2" W ✕ 68" H ✕ 6
1
/2" D 90 lbs. 40542 5 lbs. WFF81 10 lbs.
W256 M. Volt L.P. 25,000 4" 1/2" 16
1
/2" W ✕ 68" H ✕ 6
1
/2" D 90 lbs. 40542 5 lbs. WFF81 10 lbs.
W351 Bulb Nat. 35,000 4" 1/2" 16
1
/
2
" W ✕ 68" H ✕ 6
1
/
2
" D 90 lbs. 40542 5 lbs. WFF81 10 lbs.
W355 M. Volt Nat. 35,000 4" 1/2" 16
1
/2" W ✕ 68" H ✕ 6
1
/2" D 90 lbs. 40542 5 lbs. WFF81 10 lbs.
W352 Bulb L.P. 35,000 4" 1/2" 16
1
/2" W ✕ 68" H ✕ 6
1
/2" D 90 lbs. 40542 5 lbs. WFF81 10 lbs.
W356 M. Volt L.P. 35,000 4" 1/2" 16
1
/
2
" W ✕ 68" H ✕ 6
1
/
2
" D 90 lbs. 40542 5 lbs. WFF81 10 lbs.
W501 Bulb Nat. 50,000 4" 1/2" 16
1
/
2
" W ✕ 68" H ✕ 6
1
/
2
" D 134 lbs. N/A N/A WFF81 10 lbs.
W505 M. Volt Nat. 50,000 4" 1/2" 16
1
/2" W ✕ 68" H ✕ 6
1
/2" D 134 lbs. N/A N/A WFF81 10 lbs.
W502 Bulb L.P. 50,000 4" 1/2" 16
1
/
2
" W ✕ 68" H ✕ 6
1
/
2
" D 134 lbs. N/A N/A WFF81 10 lbs.
W506 M. Volt L.P. 50,000 4" 1/2" 16
1
/
2
" W ✕ 68" H ✕ 6
1
/
2
" D 134 lbs. N/A N/A WFF81 10 lbs.
Model Type Type BTU/Hr. Vent Gas Finished Shipping
Number Control Gas Input Size Inlet Dimensions Weight Model Weight Model Weight
Rear Register Kit
Fan Kit
SINGLE
WALL
One or two fan kits may be used on dual-wall furnace.
DUAL
WALL
SPECIFICATIONS
14
1
/
4
"
MIN
.
14
1
/
2
"
MAX.
65
3
/
4
"
45
3
/
4
"
12
5
/
8
"
8
1
/
4
"
PLASTER
PLATE
REAR
REGISTER
FRAME
OPENING
FOR REAR
REGISTER
MODEL
OPENING
7/8
"
FROM
EACH STUD
NAIL TO
STUDS
PLASTER
STUD
PLASTER
4
"
4
"
ROUGH-IN DIMENSIONS
REAR REGISTER OUTLET LOCATION
Form No. GWF 15M 10/05
Engineered for years of efficient, trouble free service
Featuring 20 gauge aluminized combustion chambers, warranted for 10
years.