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Figure 4. Non-Combustible Platform.
Notes:
1. Blocks must provide solid base and be braced so they
cannot slip out of place.
2. Air openings in blocks must be arranged to provide
unrestricted opening through entire width or length of
base.
Figure 3. Outdoor Heater Installation.
utility room. In the United States there must be a
minimum of 4 feet (1.22 m) horizontally or vertically
between the heater and any door, glass opening, or
gravity inlet to a building (see Figure 3).
WARNING
United States
Do not install the heater with the top of the
vent assembly within 4 feet (1.22 m) of any
opening into a building.
Canada
Do not install the heater with the top of the
vent assembly within 10 feet (3.05 m) of any
opening into a building.
If the heater is installed under an overhang, there
must be a minimum clearance of 5 feet (1.5 m) above
the top of the heater and the structure should not
overhang the heater more than 12 inches (0.30 m). The
area under the overhang must be open on three sides.
This prevents combustion gases from being diverted
into living areas through doors, windows, or gravity
inlets.
If the heater is installed close to a structure,
protect it from rain water runoff with rain gutters on
the roof or other measures. Do not locate the heater
near sprinkler systems that could spray water on it.
Avoid locations where wind deflection off nearby
structures might cause wind loading and downdraft
conditions. Where downdraft conditions exist, locate
the heater at least 3 feet (0.91 m) from vertical
surfaces (e.g., nearby buildings and walls). The
addition of a vent cap may be necessary.
2C-3. Flooring - Typical Installation
Do not install the heater directly on a combus-
tible wood or carpet floor without placing a non-
combustible platform between the floor and the heater.
In the United States, the National Fuel Gas Code
allows a heater to be placed on a combustible surface
when there is a platform under the heater made of
hollow masonry no less than 4 inches (102 millimeters
[mm]) thick, covered with sheet metal at least 24 gauge
thick and extending beyond the full width and depth of
the heater by at least 6 inches (76.2 mm) in all direc-
tions. The masonry must be laid with ends unsealed,
and joints matched to provide free circulation of air
from side to side through the masonry (see Figure 4). If
the heater is installed in a carpeted alcove, the entire
floor of the alcove must be covered by a non-combus-
tible panel. You can obtain a non-combustible base
from Teledyne Laars, part number 10521701-05.
2D. Combustion and Ventilation Air
Supply
All indoor installations must have openings to
outside air for combustion, ventilation, and dilution of
flue gases from inside the building (see Figure 2 and
Table 1). Teledyne Laars does not recommend indoor
installations that do not provide combustion air from
outside the building.
All outdoor shelter installations (Canada only)
must have uninterrupted openings to outside air for
combustion and ventilation. The installation must be in
accordance with the latest edition of CAN/CGA B149.
Teledyne Laars does not recommend outdoor shelter
installations that depend on combustion air for com-
bustion.
If the heater is installed in a residential garage, or
where flammable vapors will be present, the