What sort of capacity should a new cooker hood have? Capacity depends largely on the size of the kitchen. A good rule of thumb is that the hood should be able to replace the air 10 to 20 times an hour. For instance, if a kitchen measures 4 x 4 m with a ceiling height of 2.5 m, the cooker hood should replace approximately 400- 800 m3 per hour.
There will always be some loss of pressure when installing a hood. That is why it is important to observe the following rules:
• Always observe the hood’s recommended venting diameter (O) specified on the venting tube or pipe.
• Where possible, use smooth pipes to minimise air resistance.
• Try to make the installation as short as possible and with as few bends in the pipes as possible.
• You want gentle curves in the pipe rather than sharp bends, so that the air can pass through unhindered, minimising pressure loss.
The necessary extraction capacity is determined by the volume of the kitchen. The volume of the kitchen space can be calculated as follows: width x height x depth. Calculation of the power of the hood needed: volume of the kitchen x 10.
Number of meters
Number of kinks = 1 m
Pressure loss in m3/h