A Deposit Thickness Test is an approved technique that is used to assess the level of deposit build up within ventilation ductwork. The tests provide a reliable and quantitative way of measuring the degree of cleanliness of your ductwork, which in turn will help to determine when and how frequently cleaning is likely to be required in order to keep your ventilation up to TR19 standards.
|WFTT measurement||Recommended action|
|200 μm as a mean across the system||Complete cleaning required|
|Any single measurement above 500 μm||Urgent local cleaning required|
The mean measurement is calculated by dividing the total of the test results by the number of testing locations. All reports following a clean should show the Wet Film Thickness Test (WFTT) results prior to cleaning (See table below for an example). From this you will be able to identify if the system is staying within the recommended limits.
|Wet Film Thickness Test||
|1. Canopy||180 µm||<50µm|
|2. Canopy behind filters||>800 µm||<50µm|
|3. Main Duct Run||>800 µm||<50µm|
|4. Fan||>800 µm||<50µm|
|5. Discharge||>800 µm||<50µm|
Wet Film Thickness Test Mean Before Cleaning = 676 µm
The “Mean” of this system shows that the system was well over due a clean and should be considered for re-cleaning or inspection within a shorter period.
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Everything can be deep cleaned in your kitchen and Blitz Group Ltd specialises in oven cleaning, deep fat fryers, fridges, tiles, floors and grills - maintaining equipment and protecting your business by reducing the fire risk associated with the build-up of grease, carbon fat and grime.
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The Regulatory Reform (Fire Safety) Order 2005 came into effect in April 2006. This places the onus on building operators to appoint a responsible person for fire safety and this responsible person needs to have a fire risk assessment carried out. A risk assessment should include any kitchen extract system within or passing through a building and should identify fire risks and ways of removing or reducing the risks. Failure to carry out a risk assessment and undertake risk reduction measures could, in the event of injury or death lead to an HSE prosecution of the individual(s) and company responsible. EC directives incorporated into the above legislation require that ventilation systems are properly cleaned and tested by a professional contractor.
Health and safety regulations demand high standards of cleanliness for all areas of commercial kitchens. The combined risk of legal action and damage to reputation can be greatly reduced by regular Blitz Group Ltd kitchen equipment cleaning contracts. We are accredited members of BESA and are rigorously inspected and assessed annually to ensure reputability, quality works, health & safety standards in this industry.
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