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2)
Ventilation by Mechanical Evacuation
Ventilation by mechanical evacuation is sufficient if 10 m
ventilated out of the installation room.
The air/products of combustion mixture must be evacuated above the radiant heaters using fan(s). It shall
only be possible to operate the radiant heaters whilst the exhaust airflow is proven.
The maximum horizontal distance between a radiant heater and a fan shall be:
6 (six) times the fan mounting height in the case of wall openings
3 (three) times the fan mounting height in the case of roof openings
Note: Mechanical exhaust air openings must be positioned such that the burner stability of the nearest appliance is
unaffected.
3)
Ventilation by Natural Air Change
Gas-Fired radiant patio heaters may be operated without any special exhaust system if the exhaust gases are
discharged to the outside atmosphere by a sufficient natural air change in the installation room.
Furthermore, no provision for thermal or mechanical ventilation is required in the following particular cases:
Buildings with natural air change greater than 1.5 volumes per hour
Buildings with a density of operating heat input not greater than 5W/ m
4)
Air Supply
Air supply openings are required to admit air and shall be located below the radiant heaters.
The total area of the unobstructed cross-sections of all the air supply openings shall not be smaller than the total
area of the unobstructed cross-sections of all the exhaust openings.
Slits and gaps of fixed cross-section can also be used as air supply openings.
Where the air supply openings can be closed, it shall only be possible to operate the radiant heaters when they are
open.
B. Heaters installed OUTDOOR must be used in amply ventilated areas. An amply ventilated area must have a
minimum of 25% of the surface area open. The surface area is the sum of the walls surface.
18.0)
LIGHTING AND SHUTDOWN INSTRUCTIONS
Form 44201360
Oct 2019
/h of exhaust air per kW of operating heat input are
3
35
3
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