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Cast Iron Condensing Boilers – Installation Manual
FlexCore Stainless Steel Condensing Boilers – Installation Manual
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)
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)
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)
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)
6 in (15 cm) for appliances < 10,000 Btuh
(3kW); 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)
Torus Stainless Steel Condensing Boilers & Water Heaters – Installation Manual
Per local installation codes
Figure A - Direct Vent Terminal Clearances
3 ft (91 cm) within a height of 15 ft (4.6m)
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