Thermal Solutions AMP 400 Installation, Operation And Maintenance Manual page 22

VII. Venting (continued)
Table 14: Direct Vent Terminal Clearances
Clearance above grade, veranda,
A
porch, deck, or balcony
Clearance to window or door that
B
may be opened
Clearance to permanently closed
C
window
Vertical clearance to ventilated soffit
located above the terminal within a
D
horizontal distance of 2 ft (61 cm)
from the center line of the terminal.
Clearance to unventilated soffit
E
F Clearance to outside corner
G Clearance to inside corner
Clearance to each side of center
H line extended above meter/regulator
assembly
Clearance to service regulator vent
I
outlet
Clearance to nonmechanical air
supply inlet to building or the
J
combustion air inlet to any other
appliance
Clearance to a mechanical air
K
supply inlet
Clearance above paved sidewalk or
L paved driveway located on public
property
Clearance under veranda, porch
M
deck, or balcony
* Clearance in accordance with local codes and the requirements of the gas supplier.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both
dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
Notes:
1) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
2) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
3) If locally adopted installation codes specify clearances different than those illustrated, then the most stringent
clearance shall prevail.
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Canadian Installations
18 in. (46 cm)
6 in (15 cm) for appliances ≤
10,000 Btuh (3 kW), 12 in (30
cm) for appliances > 10,000 Btuh
(3 kW) and ≤ 100,000 Btuh (30
kW), 36 in (91 cm) for appliances
>100,000 Btuh (30 kW)
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3 ft (91 cm) within a height of
15 ft (4.6 m)
3 ft (91 cm)
6 in (15 cm) for appliances ≤
10,000 Btuh (3 kW), 12 in (30
cm) for appliances > 10,000 Btuh
(3 kW) and ≤ 100,000 Btuh (30
kW), 36 in (91 cm) for appliances
>100,000 Btuh (30 kW)
6 ft (1.83 m)
7 ft (2.13 m) †
12 in (30 cm) ‡
NOTICE NOTICE
US Installations
1
12 in (30 cm)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3 kW), 9 in (23
cm) for appliances > 10,000 Btuh
(3 kW) and ≤ 50,000 Btuh (15
kW), 12 in (30 cm) for appliances
> 50,000 Btuh (15 kW)
6 in (15 cm) for appliances ≤
10,000 Btuh (3 kW), 9 in (23 cm)
for appliances > 10,000 Btuh (3
kW) and ≤ 50,000 Btuh (15 kW),
12 in (30 cm) for appliances >
50,000 Btuh (15 kW)
3 ft (91 cm) above if within
10 ft (3 m) horizontally
7 ft (2.13 m) for mechanical draft
systems (Category I appliances).
Vents for Category II and IV
appliances cannot be located
above public walkways or other
areas where condensate or vapor
can cause a nuisance or hazard*
AMP 400-1000L I&O Manual
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