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Installer's Guide
Clearance above grade, veranda,
A=
porch, deck, or balcony
Clearance to window or door that may
B=
be opened
Clearance to permanently closed
C=
window
Vertical clearance to ventilated soffit
located above the terminal within a
D=
horizontal distance of 2 feet (61 cm)
from the center line of the terminal
E=
Clearance to unventilated soffit
F=
Clearance to outside corner
G=
Clearance to inside corner
Clearance to each side of center line
H=
extended above meter/regulator
assembly
Clearance to service regulator vent
I=
outlet
Clearance to nonmechanical air supply
J=
inlet to building or the combustion air
inlet to any other appliance
Clearance to a mechanical air supply
K=
inlet
Clearance above a paved sidewalk or
L=
paved driveway located on public
property
M-
Clearance under veranda, porch, deck,
=
or balcony
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.
†. A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwelling and serves both dwellings.
‡. Pemitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's Installation Instructions.
Figure 26
DOWNWARD VENTING
Furnace may be in vertical or horizontal configuration.
All horizontal pipes must be
supported at maximum of 3
foot intervals
NOTES:
A) Condensate trap for vent pipe must be a minimum of 6 inches in height.
B) Condensate trap for vent and inlet pipe must be connected into a condensate drain pump; an open or vented drain;
or it can be connected to the outlet hose of the Furnace condensate trap. Outdoor draining of the Furnace and coil
condensate is permissible if allowed by local codes.
▲
CAUTION
!
Caution should be taken to prevent drains from freezing or causing slippery conditions that could lead to personal in-
jury. Excessive draining of condensate may cause saturated ground conditions that may result in damage to plants.
C) The condensate trap should be primed at initial start up prior to heating season operation.
22
Direct Vent Terminal Clearances
Canadian Installations
12 inches (30 cm)
6 inches (15 cm) for appliances =/< 10,000 Btuh (3
kw),
12 inches (30 cm) for appliances > 10,000 Btuh (3
kw)
and =/< 100,000 Btuh (30 kw),
36 inches (91 cm) for appliances > 100,000 Btuh (30
kw)
*
*
*
*
*
3 feet (91 cm) with a height 15 feet (4.5 m) above the
meter/regulator assembly
3 feet (91 cm)
6 inches (15 cm) for appliances =/< 10,000 Btuh (3
kw),
12 inches (30 cm) for appliances > 10,000 Btuh (3
kw)
and =/< 100,000 Btuh (30 kw),
36 inches (91 cm) for appliances > 100,000 Btuh (30
kw)
6 feet (1.83m)
7 feet (2.13 m) †
12 inches (30 cm) ‡
Slope 1/4" per ft.
Slope 1/4" per ft.
US Installations
12 inches (30 cm)
6 inches (15 cm) for appliances =/< 10,000 Btuh (3
kw),
9 inches (23 cm) for appliances > 10,000 Btuh (3 kw)
and =/< 50,000 Btuh (15 kw),
12 inches (30 cm) for appliances > 50,000 Btuh (15
kw)
*
*
*
*
*
*
*
6 inches (15 cm) for appliances =/< 10,000 Btuh (3
kw),
9 inches (23 cm) for appliances > 10,000 Btuh (3 kw)
and =/< 50,000 Btuh (15 kw),
12 inches (30 cm) for appliances > 50,000 Btuh (15
kw)
3 feet (91 cm) above if within 10 feet (3m)
horizontally
*
*
DOWNWARD VENT LENGTH IS
LIMITED TO A MAXIMUM OF 15
EQUIVALENT FEET.
Upflow or
Downflow
6" Min.
▲
CAUTION
!
40 Inch
Furnace
18-CD25D1-2
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