All kitchen area extraction or mechanical ventilation equipment is to be included as part of the SBEMassessment process, in order to account for the additional energy requirements for the conditioning of higherair change rates. i.e. extractor hoods are no longer to be disregarded and are to be assessed as part of theextraction rate for the zone(s) concerned.
If performance details of extraction units are unknown then defaults should be assumed in accordance withCL6.07 ‘Estimating Local Mechanical Exhaust rates in existing buildings’ with the following table provided foradditional guidance:-
| Description |
SBEM Activity |
CEPC 6.07Vent RoomType |
AssumedExtract Rate a/c per hour |
| Small kitchen orkitchenette or tea makingfacility with a single wallor window extractor fanonly. Very limited foodpreparation activitiestaking place |
Generic Office(was Tea Making) |
Tea making |
10 |
| ‘Domestic’ type kitchenwith a single cooker hoodextraction unit and/or asingle wall or windowextractor fan and limitedfood preparation activities |
Food preparation |
Kitchen –domestic |
15 |
| ‘Non-domestic’ kitchenwith multiple cooker hoodextraction and / ormultiple wall or windowextraction units Extensivefood preparationactivities, e.g. kitchenserving restaurant, canteen, residentialschools, colleges etc. |
Food preparation |
Kitchen – non domestic |
40 |
Mike Gordon
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