Installation and Operation Guide
DUCTING AND EXTRACTION LEVELS
WHISPAIR ducting is designed to ensure optimum performance for your rangehood. Please follow the installation instructions 
carefully.
Every WHISPAIR rangehood must be ducted to the Inline or Externally mounted KLEENAIR fan motor unit by the use of 
non-ammable ducting. The rangehood must not be ducted into a wall cavity or a ceiling space where a build-up of grease can 
occur and become a potential re risk. Ensure the external outlet on the KLEENAIR unit is not covered and the air ow is not 
restricted in any way as this may result in reduced performance.
The duct must at all times have a cross sectional surface area equivalent to the hood outlet. The hood outlet has a circular cross 
section of 200mm in diameter or an approximate area of 31,400mm. Do not reduce the duct size at any time and avoid sharp 
bends. If the duct run is longer than six (6) metres, it may be necessary to enlarge the duct size to ensure optimum performance. 
The manufacturer does not guarantee performance when the duct length is greater than six (6) metres.
Ensure that all ducting is correctly tted and sealed with pipe clips, duct tape or silicone to ensure that fumes do not escape prior 
to reaching the KLEENAIR fan motor unit.
The WHISPAIR extraction calculations are based upon a 50pa change of head of pressure loss and are used to factor the variance 
of air ow resistance through the ducting. 50pa is equivalent to approximately four (4) metres (the recommended length) of exi 
ducting with one gentle bend, which is above and beyond the industry standard of one straight metre of ducting. The KLEENAIR 
LITE offers a powerful 800 cubic metres per hour (223 litres per second) of air movement. The KLEENAIR PRO offers 1140 cubic 
metres per hour (317 litres per second) whilst for serious users the KLEENAIR PRO PLUS boasts a market leading 2010 cubic 
metres per hour (558 litres per second).
6
THE RECOMMENDED DUCT
LENGTH (INSTALLATION DISTANCE)
 IS 4 METRES.
THE MINIMUM INSTALLATION
DISTANCE IS 3 METRES.
GENTLE BENDS IN THE DUCTING
ARE RECOMMENDED AS IT ASSISTS
IN MUFFLING NOISE FROM THE 
REMOTE FAN UNIT.
To Rangehood Unit
Gentle Bend
In Ducting










