30th October 2015

Kitchen Extraction Systems

What is a Kitchen Extraction System?

Kitchen Extraction Systems are intended to collect & remove contaminants, heat & moisture from cooking appliances. They typically consist of a canopy (usually including grease filters), extraction plenum, ducting, extraction fans & discharge ducts.

Kitchen Extraction Systems can be particularly hazardous due to the potential for grease build-up or carbon deposits which can cause poor hygiene, bad odour, vermin, mechanical efficiency problems & are an established fire hazard.

What does the law say?

B&ES (formerly HVCA) TR/19 Section 7:
The need for specialist cleaning of extract systems will depend on the level of usage of the cooking equipment, types and quantity of cooking and other risk factors such as vulnerability of the systems to ignition and of the building and its occupant/user to system fire, hygiene, vermin and mechanical hazards. Typical cleaning intervals are shown below:


The Workplace (Health, Safety and Welfare) Regulations 1992:
These Regulations require that employers provide effective and suitable ventilation in every enclosed workplace. This includes kitchens, which need ventilation to create a safe and comfortable working environment. Catering and cooking can produce significant amounts of fumes and vapours, as well as large amounts of heat. Mechanical extraction, via a canopy hood installed over the cooking appliances, can remove these fumes and vapour and discharge them to a safe location.

Gas Safety (Installation and Use) Regulations 1998: 
These Regulations impose additional requirements and apply to gas appliances found in most catering premises. Some gas appliances will be a type (known as type B) that require a flue to comply with the Regulations. Where extraction serves that purpose, it is considered a flue and requires an appropriate interlocking system connecting the airflow to the gas supply.
Gas safety in catering is the subject of Catering Information Sheet 23. However, in considering general ventilation requirements for kitchens it is important to consider the impact of such ventilation on gas appliances covered by these regulations. It is particularly important to ensure there is adequate make-up air for gas-fired appliances, the lack of which can lead to incomplete combustion and an accumulation of combustion products, such as carbon monoxide.

Effective kitchen ventilation systems:

The objectives of an effective kitchen ventilation system are to:

  • remove cooking fumes at source, ie at the appliance;
  • remove excess hot air and bring in cool, clean air, so the working environment is comfortable. Inadequate ventilation can cause stress, contributing to unsafe systems of work and high staff turnover;
  • make sure that the air movement in the kitchen does not cause discomfort, e.g. from strong draughts;
  • provide enough air for complete combustion at fired appliances, and prevent the risk of carbon monoxide accumulating;
  • be easy to clean, avoiding build-up of fat residues and blocked air inlets, which lead to loss of efficiency and increased risk of fire;
  • be quiet and vibration free.

The ventilation system design needs to take account of the:

  • cooking load;
  • amount of cooking equipment used;
  • layout and shape of the kitchen;
  • number of staff;
  • need for easy cleaning and maintenance.

What Hydro-X offers:

Hydro-X can support and advise you on your legal obligations to maintain clean and effective Kitchen Extraction Systems:

  • We will document all of the relevant information including the specifications for the fans, motors, ducting and hoods as required by the regulations.
  • Examinations are carried out by our trained and experienced engineers using the latest technology to achieve the most accurate results.
  • Where necessary, whether as part of legal requirements, or to comply with insurances, or as planned maintenance, our engineers will carry out thorough cleaning of the systems.
  • All the necessary documentation, including before and after photographs are presented in a clearly defined report, to provide you with an easily referenced audit for safe system compliance.
Before, during and after photographs of a recent Kitchen Extract clean of the catering area at a well-known northern shopping center.  
KEX-clean-before-150x150   KEX-clean-during-150x150   KEX-clean-after-150x150
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