Please note that this is a reference guide. Relevant local council and national bulding regulations will also apply.
Commercial kitchen extraction ventilation is essential for well function food outlet or restaurant. A commercial extraction system is composed of three main elements:-
- The Extractor Hood
- The Primary Filtration also known as baffle filters, older mesh filters are known to be a fire hazzard and are being phased out.
- A lip all around the extraction to ensure that condensate is retained within the canopy.
- A negative pressure fan ducting system
- Fan Motor
- Speed controller
- Odour Control
- Efflux or Directional Cowl
How to size an extractor hood
To calculate the extractor hood size required. Simply take the size of the total cooking equipment and add 300mm (1Ft) on either end.
You have cooking equipment:-
2 450mm Fryers
1 900mm 6 Burner Range
1 600mm Flat plate griddle
Total Width = 2100mm Long
Add 300mm + 300mm = 600mm
Required Hood Length = 2100mm + 600mm = 2700mm Long Extractor Hood
How to size your extractor fan?
This is a bit more complicated, but in simple terms. If there is a lot of ducting, odour control or large volumes of air to shift, then you will probably need a turbo prop fan. If the kitchen air is simply being ejkected to the outside then a plate fan will you suit you very well. Please feel free to pick our brains on which fan would suit you best.
Do you need make-up air or replacement air
DW/172 says yes it is always needed. It can however be introduced by the following methods:-
Natural ducted - as short as possible and at high level
Mechanical input at maximum 85% the rest should infiltrate naturally.
It is imperative that the kitchen remains a negative pressure area, i.e air is drawn in from other areas than the kitchen. In odour that odours do not escape from the kitchen into the restaurant area as an example
It is also important that the air is pre-filtered, as the fresh air will always be contaminated with bugs, insects, dust and other airbourne contaminates.
Fire supression systems are a great bonus to kitchen safety and loss of property and profit. If you are on the fence about fire supression systems then think about how much effort, time and money you have invested into your restaurant business. And then consider what you could lose. If you would like a free consultation, or a simple cost estimate. please get in touch.
- See more at: https://iwantcanopy.co.uk/kitchen-extraction-blog/Extractor-Hood-Sizing-Guide#sthash.ZknfCoH4.dpuf