Heatilator • Novus NNXT • 4055-879 • Rev E • 5/10
22
Dimension Descriptions
A Clearance above the ground, a veranda, porch, deck or balcony - 12 in.
(30 cm) minimum. *
B Clearance to window or door that may be opened – 10,000 BTUs or less,
6 in. (15 cm) minimum; 10,000-50,000 BTUs, 9 in. (23 cm) minimum;
over 50,000 BTUs, 12 in. (30 cm) minimum. *
C Clearance to permanently closed window – 12 in. (30 cm) minimum
- recommended to prevent condensation on window.
D Vertical clearance to ventilated soffi t located above the termination within
a horizontal distance of 2 ft (60 cm) from the centerline of the termination
– 18 in. (46 cm) minimum. **
E Vertical clearance to unventilated soffi t - 12 in. (30 cm) minimum. **
F Clearance to outside corner - 6 in. (15 cm) minimum.
G Clearance to inside corner - 6 in. (15 cm) minimum.
H Not to be installed above a meter/regulator assembly within 3 ft (90 cm)
horizontally* from the center line of the regulator (Canada only)
I Clearance to service regulator vent outlet – 3 ft (.91 m) U.S. minimum
and 3 ft (.91 m) Canada minimum. *
J Clearance to non-mechanical air supply inlet into building or the
combustion air inlet to any other appliance – 9” (23 cm) U.S. minimum
and 12 in. (30 cm) Canada minimum. *
K Clearance to mechanical air supply inlet - 3 ft (.91 m) U.S. minimum and
6 ft (1.8 m) Canada minimum. *
L Clearance above a paved sidewalk or paved driveway located on public
property - 7 ft (2.1 m) minimum.
A vent may not terminate directly above a sidewalk or paved driveway
which is located between two single family dwellings and serves both
dwellings.
M Clearance under veranda, porch, deck or balcony - 12 in. (30 cm)
minimum. * Recommended 30 in. (76 cm) for vinyl or plastic.
Only permitted if veranda, porch, deck or balcony is fully open on a
minimum of 2 sides beneath the fl oor. *
N Vertical clearance between two horizontal termination caps – 12 in. (30
cm) minimum.
O Horizontal clearance between two horizontal termination caps – 12 in.
(30 cm) minimum.
P 6” - Non-vinyl sidewalls
12” – Vinyl sidewalls
Q 18” – Non-vinyl soffi t and overhang
42” – Vinyl soffi t and overhang
R 8 ft.
D
E
B
L
C
V
V
B
F
V
B
V
V
B
X
A
J
Fixed
Closed
M
V
K
X
RESTRICTION ZONE
(TERMINATION NOT
ALLOWED)
AIR SUPPLY INLET
X
GAS METER
V TERMINATION CAP
H
B
Openable Fixed
Closed
V
I
V
O
N
Q
P
R
T
S
Electrical
Service
V
U
V
U
V
W
D*
V
V
Covered Alcove
Applications
Clearances to Electrical Service
A
V
V
G
Measure horizontal clearances
from this surface.
Measure vertical clearances
from this surface
S
min
T
max
1 cap
3 ft
2 x S actual
2 caps
6 ft
1 x S actual
3 caps
9 ft
2/3 x S actual
4 caps
12 ft
1/2 x S actual
S
min
= # term caps x 3
T
max
= (2/# term caps) x S (actual)
U 6” min. – Clearance from sides of electrical service.
W 12” min. – Clearance above electrical service.
* As specifi ed in CGA B149 Installation Codes
Note: Local codes or regulations may require different clearances.
** Clearance required to vinyl soffi t material – 30 in. (76 cm) minimum.
Note: Location of the vent termination must not interfere with access to
the electrical service.
Figure 6.3
Minimum Clearances for Termination
CAUTION: IF EXTERIOR WALLS ARE FINISHED WITH VINYL SIDING, IT IS SUGGESTED THAT A VINYL PROTECTOR KIT BE INSTALLED.
WARNING!
In the U.S.: Vent system termination is NOT permitted in screened
porches. You must follow side wall, overhang and ground clearances as
stated in the instructions.
In Canada: Vent system termination is NOT permitted in screened
porches. Vent system termination is permitted in porch areas with two
or more sides open. You must follow all side wall, overhang and ground
clearances as stated in the instructions.
Hearth & Home Technologies assumes no responsibility for the improper
performance of the appliance when the venting system does not meet
these requirements.
