Thetford N100, Installation Manual

15 

4.

VENTILATION 

Perfect ventilation is very important to ensure the cooling system works properly. Heat is generated in the 
cooling system. The heat must be able to escape into the open air. Cold air extraction is necessary to allow 
the cooling system to cool down again and to maintain the circulation of air.  
 

FIGURE   5

: The refrigerator is ventilated by means of two openings in the wall of the caravan or 

motor home across which ventilation gratings are placed. Cold air comes in through the lower 
grating. The cooling system heats the cold air and it takes out again through the upper grating 
(chimney effect).  

4.1 

Installation ventilation gratings 

-

Install the ventilation gratings exactly as described in this manual. 
Any other method of installation will invalidate the manufacturer’s warranty for the 
refrigerator.   

-

Always fit the ventilation gratings at the rear of the refrigerator. 
Fitting them at the side will reduce the refrigerator’s cooling capacity.  

FIGURE 6

: 

The lower ventilation grating

Make sure the lower ventilation grating is always placed right behind the combustion chamber. This 
grating is also used for maintenance access. In case of models with a wheel  arch recess (N80 / 90 / 
112), the bottom of the lower ventilation grating must be level with the top of the wheel  arch.    
 

There must be a hole in the floor. If a leak occurs, this hole will allow the gas to stream 
outside instead of building up on the floor. A grating is used for this matter with the 
N80/90/112 models. The other models (N100/109/110/145) have a grating which is 
situated above floor level and therefore need an extra hole in the floor, with a diameter in 
conformity with local regulations, but we advice a diameter of  at least Ø40 mm.

FIGURE 7

: 

The upper ventilation grating 

The installation of the upper ventilation grating influences the cooling capacity. The best result is 
achieved when this grating is installed as far above the condenser as possible. Use at least a 110 mm 
distance. Situation [1] is the preferred installation procedure and creates the optimal cooling 
capacity. Situation [2] without a ventilation grating, but with a chimney on the roof, is a possibility. 
Situation [3] is often used, but results in a reduced cooling capacity. 

4.2 

Installation ventilation gratings 

FIGURE 8

: A ventilation system compromises of two sets of a vent frame [A], a vent screen [B], 

and a vent outer [C].  To install the ventilation gratings, make, using the templates provided, a 
horizontal rectangular recess in the wall of the caravan or motor home.  
 

1. 

Use the accompanying template to cut out the ventilation recess.    

2. 

Seal the vent frame [A] in a watertight way by means of sealant or butyl tape.   

3.

Only for the upper ventilation grating

: assembly the vent cap together with the vent frame 

4. 

Position the vent frame  [A] in place.    

5. 

Place the vent screen [B] in the vent frame. 

6. 

Place the vent outer [C] over the vent frame [A] and fasten it with the two retaining slides.   

5. 

8. 

6. 

7. 

ENG