Laars MagnaTherm HTD Series Installation And Operation Instructions Manual page 21

HTD
A= Clearance above grade, veranda, porch,
deck, or balcony
B= Clearance to window or door that may be
opened
C= Clearance to permanently closed window
D= Vertical clearance to ventilated soffit located
above the terminal within a 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
H= Clearance to each side of center line
extended above meter/regulator assembly
I= Clearance to service regulator vent outlet
J= Clearance to non-mechanical air supply
inlet to building or the combustion air inlet
to any other unit
K= Clearance to a mechanical air supply inlet
L= Clearance above paved sidewalk or paved Vent termination not allowed in this location
driveway located on public property
M= Clearance under veranda, porch, deck,
or balcony
Notes:
1. In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
2. In accordance with the current CAN/CSA-B149 Installation Codes.
3. Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
4. For clearances not specified in ANSI Z223.1 / NFPA 54, clearance is in accordance with local installation codes and the
requirements of the gas supplier.
5. For clearances not specified in CAN/CSA-B149, clearance is in accordance with local installation codes and the requirements of the
gas supplier.
6. IMPORTANT: All terminals must be placed so that they remain a minimum 12" above expected snow line. Local codes may have
more specific requirements, and must be consulted.
Figure 5. Combustion Air and Vent Through Side-wall.
*When vent terminal is less than 10 feet (3 m)
horizontally from a forced air inlet, the terminal must
be at least 3 feet (0.9 m) above the air inlet. (US only)
U.S. Installations (see note 1)
12 inches (30 cm)
See note 6
Direct vent only: 12 inches (30 cm);
Other than Direct vent: 4 ft (1.2m) below or to
side of opening; 1 ft (30 cm) above opening
See note 4
See note 4
See note 4
See note 4
See note 4
See note 4
See note 4
Direct vent only: 36" (91cm)
Other than Direct vent: 4 ft (1.2m) below
or to side of opening; 1 ft (30 cm) above opening
3 feet (91 cm) above if within 10 feet (3 m)
horizontally
for category IV units.
See note 4
Canadian Installations (see note 2)
12 inches (30 cm)
See note 6
36 inches (91 cm)
See note 5
See note 5
See note 5
See note 5
See note 5
3 feet (91 cm) within a height 15 feet
above the meter/regulator assembly
3 feet (91 cm)
36 inches (91 cm)
6 feet (1.83 m)
7 ft (2.1 m)
See note 5
12 inches (30 cm)
See note 5
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