17
Cast Iron Condensing Boilers – Installation Manual
FlexCore Stainless Steel Condensing Boilers – Installation Manual
K =
Clearance to a mechanical air
supply inlet
6 ft (1.83 m)
3 ft (91 cm) above if within 10 ft (3 m)
horizontally
L =
Clearance above paved sidewalk
or paved driveway located on
public property
7 ft (2.13 m)†
M =
Clearance under veranda, porch,
deck, or balcony
12 in (30 cm)‡
†
‡
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings.
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 clearances must prevail.
Torus Stainless Steel Condensing Boilers & Water Heaters – Installation Manual
Per local installation codes
Canadian Installations¹ US Installations²
A =
Clearance above grade, veranda, porch,
deck, or balcony
12 in (30 cm)
12 in (30 cm)
B =
Clearance to window or door that may
be opened
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)
4 ft (1.2 m) below or to side of opening;
1 ft (300 mm) above opening
C =
Clearance to permanently closed
window
D =
Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 ft (61 cm)
from the center line of the terminal
E = Clearance to unventilated soffit
F = Clearance to outside corner
G = Clearance to inside corner
H =
Clearance to each side of center line
extended above meter/regulator
assembly
I =
Clearance to service regulator vent
outlet
3 ft (91 cm)
Per local installation codes
Figure A - Other Than Direct Vent Terminal Clearances
Figure A - Direct Vent Terminal Clearances - Concluded
J =
Clearance to nonmechanical air supply
inlet to building or the combustion air
inlet to any other appliance
6 in (15 cm) for appliances < 10,000
Btuh (3kW); 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)
4 ft (1.2 m) below or to side of opening;
1 ft (300 mm) above opening
Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
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
3 ft (91 cm) within a height of 15 ft (4.6m)
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