Design & Manufacture

Midtherm Engineers are experienced in responding to a wide range of design briefs and have regularly overcome site constraints to fulfil client requirements. Our design team are fully versed in current regulations and apply them as necessary on all projects.

 Our canopies are manufactured in-house from austenitic grade stainless steel and subjected to strict quality control to ensure the highest standards are maintained. All canopies are fully welded and polished using our manufacturing plant, which is computer controlled to ensure accurate high quality products on every occasion.

In the kitchen environment it is essential that the extraction canopies are designed to sufficiently eliminate cooking fumes, steam and products of combustion from the working area.

The point of termination where these gases are expelled also needs to be carefully considered, with relation to any input air supply and possible nearby residents.

In order to calculate these requirements correctly the cooking appliances need to be assessed, alongside the nature of their workload and the intended locations.

Canopies can also be designed to provide fresh input air or a tempered supply, depending on the clients’ needs. These serve to provide vital ventilation for combustion as well as comfort cooling for improved and safe operating conditions.

All hoods can be supported in alternate ways depending on the individual kitchen conditions. Subject to the structural integrity of the floor, walls and roof, different types of support can be designed. All options are available as bespoke proposals, enabling our systems to overcome almost any commercial kitchen obstacle.

Previously the information supplied by our design engineers within our quotations, has been used as a guide to obtain relevant planning permission. Additionally we have provided solutions to making termination points more aesthetically pleasing by the implementation of our modified Windvent terminal range, for further details please see our brochure.

Midtherm Engineering are well versed and practiced in a wide range of current regulations and legislation with regards to design and installation of kitchen canopy systems including:

  • CIBSE TM50: 2009 (Energy Efficiency in Commercial Kitchens)
  • DW/172 (HVCA For Kitchen Ventilation Systems)
  • BS6173:2009 [Specification for installation and maintenance of gas fired catering appliances for use in all types of catering establishments (2nd and 3rd family gases)]
  • TB140 (Guidance on ventilation and extract requirements for commercial catering installations)





When undertaking the development of any canopy package, the following items are typically considered within our design process:

  • Type and size of appliances including the power source of appliances in kW.
  • Room plan including heights.
  • Estimate of cooking content (low, medium or high) and subsequent filtration control.
  • Gas solenoid safety cut off requirements.
  • CO² monitoring.
  • Heater battery requirement for tempered air input systems.
  • Extract and compensation air ductwork design (tempered or otherwise).
  • Control systems.
  • Fan selection.
  • Ductwork system / fan attenuation.
  • Fire suppression.
  • Heat recovery - Reducing energy costs whilst still providing a fresh air supply.
  • Odour control, via carbon filters or UV filtration.
  • Lighting – Varying lux levels are available to your requirements.
  • Energy efficiency – Ratio control between input and extract, with option for cooking fluctuation control.

When undertaking any canopy project, we take all of your preferences and requirements into consideration from the outset. After initial contact is made, the first step is to determine the plan area of your canopy which is done based upon calculations to suit the plan area of the cooking equipment. We then determine an extract flow rate based primarily on the cooking appliances to be installed, or secondarily a volume based on light, medium or heavy loading to give a face velocity. Once the extraction rate is known we can then calculate the necessary compensation air to suit the design brief, and the full system design can be resolved.

When the proposed system is sized and specified, we provide a thorough, competitive quotation detailing all inclusions and exclusions specific to your brief. We then ensure the transition from design and estimating through to contracting is carried out with the greatest efficiency by our highly trained and skilled team.


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