Additional Installation Notes.
Rangehoods may be ducted in two ways:
1. Ducted to the atmosphere (outside).
2. Recirculating.
We recommend ducting to the atmosphere to ensure optimum performance. Recirculating the air back into
the room should only be used when outside extraction is not possible. To ensure maximum performance when
ducting it is important the ducting that carries the fumes away, be as short and as straight as possible.
When incorporating a rangehood in the design of a kitchen the following points need to be considered to
achieve the most benefit from the rangehood.
1. Ducting from a rangehood carrying the exhaust air, should not exceed a length of three (3) metres.
2. For ducted installation we recommend using galvanised or similar metal type flue pipe. PVC pipe is not
recommended.
3. Ducting containing a 90° degree bend will encounter a loss in efficiency of approximately 35%. Additional
90° degree bends can cause losses of up to 15% per bend.
4. Ducting size should always comply with the manufacturers specification.
5. We recommend carbon filters be used when re-circulating the air into the room. There will be some loss of
air movement when carbon filters are fitted.
The following diagrams are examples of installations:
- 7 -
