Figure 3 Dimensions and Clearances (Downflow)
I _A ",Jj B I
I3/4" 7/8"
/_ y////////////////////////.'////////////////////////h ,_
MINIMUM CLEARANCES TO COMBUSTIBLE
MATERIALS FOR ALL UNITS
REAR 0
FRONT 3"
For Service 30"
ALL SIDES Of SUPPLY PLENUM 1"
SIDES O
VENT
Single Wall Vent 6"
Type B-1 Double Wall Vent 1"
TOP OF FURNACE 1"
f_
130" MIN.
_, ._ _
24" MIN
25 2O 45
DIMENSIONAL INFORMATION
MODEL
NDN3050/075FB
NDF050/075B
NDN3075HF & 100GF/KF
NDF075F/100F
NDN3125KJ/N DF125J
MODEL
NDN6050/075FB
GDE050/075B
NDN6075HF & NDN6100GF/KF
GDE075F/100F
NDN6125KJ/GDE125J
CABINET
A B C
151/2 281/2 40
191/8 281/2 40
223/4 28t/2 40
BOTTOM
OPENING
F G
14 1817/32
175/8 1817/32
211/4 1817/32
Drawing is representative some models may vary
RETURN
GAS CONNECTIONS
H J K
97/16 21/2 411/16
97/16 21/2 411/16
97/16 21/2 411/16
OPENING
D E
14 151/2
179/16 151/2
213/16 151/2
CABINET
A B C
15t/2 281/2 40
19t/8 281/2 40
223/4 28t/2 40
BOTTOM RETURN
OPENING
F G
14 1817/32
179/16 1817/32
213/16 1817/32
OPENING
D E
14 15t/2
179/16 15 t/2
213/16 151/2
GAS CONNECTIONS
H J K
9t3/t6 21/2 4tl/16
9t3/t6 21/2 4tl/16
913/16 21/2 411/16
InstallationRequirements
1. Install furnace level.
5. Maintain clearance for fire safety and servicing. A front clear-
ance of 30" is minimum for access to the burner, controls and
filter.
2.
3.
This furnace is NOT to be used for temporary heat of build-
ings or structures under construction.
Install the vent pipes as short as practical. (See Gae Vent
Installation section).
6. Use a raised base if the floor is damp or wet at times.
7. Residential garage installations require:
• Burners and ignition sources installed at least 18" (457mm)
above the floor.
4. Do NOT install furnace directly on carpeting, tile or other
combustible material other than wood flooring.
• Furnace must be located or physically protected from pos-
sible damage by a vehicle.
441 012603 02
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