Roberts Gorden 100 Manuel D’Utilisation

19 of 47

When installed as a separated combustion heater 
(UHD[X]S), the air for combustion is drawn in from 
outside the building. 

It is important to ensure that there is adequate fresh 
air supply at all times for both combustion and 
heating requirements in accordance with local and 
national codes. 

Where ventilation is required, air must be taken from 
an outside point where it is not likely to be 
contaminated or obstructed.

If outside combustion air supply is required, 
separated combustion model (UHD[X]S) heaters 
must be used.

Caution: If the building has a slight negative 
pressure or corrosive contaminants such as 
halogenated hydrocarbons are present in the air, an 
outside combustion air supply to the heater is 
required. Seal all combustion air pipe joints.
The flexible air duct may have to be insulated to 
prevent condensation on the outer surface. The 
outside air terminal must not be more than 1' (31 
cm) above the vent terminal.

Follow the constraints listed 

on Page 13, Section 7.7.