Job Type: Commercial Kitchen Extract Hood Cleaning & Deep Clean following a flood within the premises.

Site details: Popular Village gastro pub.

Special features: System comprises of one canopy hood (3 x 0.5 x 1)m2 with baffle filters and a main extract fan

The system operates under high grease load and temperature. Due to the varying types of cooking, this system is cleaned on a 6 monthly basis.


  1. Kitchen Extract Systems have an increased fire, odour, vermin & hygiene risk compared to general supply and extract systems. This is due to the grease build up acting as a potential ignition source, contributed by the heat in the kitchen, possibly elevated oxygen levels from a fresh air supply source and the general deposition of cooking oils on ventilation system components and the ductwork itself acting as fuel.
  2. Wet Film Thickness Tests (WFTT) were carried out at various locations throughout the system, to determine the overall level of grease deposition. Individual readings of over 50 microns are deemed unclean. An average reading across the system of 200 microns or more is deemed unclean. Any individual readings in excess of 500 microns require immediate attention. In accordance with BESA TR19, tests were carried out at the following locations (where accessible).
  3. The WFTT readings pre clean were as follows: Canopy 800 microns. Ductwork from the canopy N/A, Fan unit N/A, ductwork after fan unit N/A.
  4. The work was carried out successfully by degreasing and deep cleaning the canopy, and grease filters and deep cleaning the sinks, tables, racking, cooker hob, shelving and fryer.
  5. All areas were properly cleaned with results below 50 microns.
  6. A number of items were also deep cleaned including deep fryer, ovens & prep tables.

No faults or recommendations other than continued cleaning at the recommended intervals.

Before & After Photos

Kitchen Extract Deep Cleaning Case Study 2016
Kitchen Extract Deep Cleaning Case Study