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Typical Kitchen Extract Solutions

We have set out below a recommendation for the control of grease, smoke and odourfrom a fast food outlet using a char grilling process. There are varying degrees ofpollution created by restaurants dependant on the type of cooking. A char grillingoperation provides a high level of smoke, grease and odour and will typically need moreequipment than other types of systems.

The cooking will take place under combined or in some cases separate canopies. Thecanopies will be fitted with conventional grease filters.

Particulate Phase Control

A double pass Electrostatic Precipitator should be installed within the ducting. The useof a double pass system greatly increases efficiency and provides minimal breakthroughas the filters become contaminated in between service visits. The unit should be locatedas close to the canopy as possible, taking into account operational fume temperature,this should reduce grease build up within the ducting and in turn reduce the need forduct cleaning. These units should always be installed prior to the fan and on a straightlength of ducting to ensure uniform airflow.

Gaseous Phase Control

A UV-C system should be installed directly after the Electrostatic Precipitator. This shouldalso be before the fan to ensure uniform air velocity and distribution throughout the unit.It is important to have a reasonable length of ducting after the UV-C system as theoxidisation process continues after leaving the unit. In applications where a high levelof control with minimal breakthrough is required a Mixed Media or Carbon filter systemmay be used as a final odour / gaseous phase control stage.


Typically a four weekly maintenance will be required which will involve an engineerattending the restaurant to exchange the ionisers, filters and collector cells in theElectrostatic Precipitator. The exchange components are cleaned at our works using anindustrial centrifugal washing process, all components are rotated and the client doesnot need to purchase spares. The UV lamps are protected by the Electrostatic filter butthey will be cleaned using an alcohol based product during the service visit. UV lampsare normally changed annually and mixed media or carbon filters are typically changedevery six months.