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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).
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
Figure 3. Outdoor Heater Installation.
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
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 4.
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
