Combustion Air Requirements - Brant Radiant Heaters QTD Series User Instruction

3.0 Installation •

Combustion Air Requirements

Combustion Air Requirements
Combustion air may be supplied to the heater by indoor or outdoor means.
If using combustion air intake from indoors, the required volume of the space must be a minimum of 50 ft
per 1000 BTU/h (4.8 m
unusually tight construction with air infiltration rates of less than 0.40 air changes per hour, outside
combustion air is typically needed unless the sheer size of the building allows otherwise. Contact the
factory for further determination of air infiltration rates.
Non-contaminated outside air for combustion must be ducted to the heater if any of the following apply:
• Chemicals such as chlorinated or fluorinated hydrocarbons (typical sources are refrigerants, solvents,
adhesives, degreasers, paints, paint removers, lubricants, pesticides, etc.).
• High humidity.
• Contaminants such as sawdust, welding smoke, etc.
• Negative building pressure.
• Unusually tight construction where there is an air infiltration rate of less the 0.40 air changes per hour.
Combustion air intake may be located on either the sidewall or roof (see figures 3.15 - 3.17).
Figure 3.15 • Optional Vertical Outside Air Supply for Single Heater Intake
4" pipe
Figure 3.16 • Horizontal Outside Air Supply for Single Heater Intake
Air Intake Cap
3
/kW) unless the building is of unusually tight construction. If the building is of
Roof Intake Cap
18 in. Minimum
Air Inlet Connection
Air Inlet Connection (Flexible boot and band clamps are recommended)
Wall
4" pipe
Roof
(Flexible boot and band clamps are recommended)
Burner
Box
Burner
Box
24
QTD
• Side View
• Side View
Series
3