Air Conditioning and Ventilation Systems.
~ Providing a Breath of Fresh Air! ~
Thoroughvent Ltd,

Ventilation & HVAC Systems

Explore our complete guide to commercial ventilation systems, covering BESA DW172-compliant Kitchen Extract, energy-saving Heat Recovery (HRV), and advanced HVAC and Close Control solutions. We deliver optimal air quality and efficiency for your commercial premises.

Contact Us today for a free no-obligation site survey, quotation and expert advice tailored to your property.

Kitchen Extract and Fresh Air Systems

Design & Manufacture

We design, supply, and install commercial kitchen extract systems across Sussex, ensuring full compliance with BESA DW172—the industry standard for kitchen ventilation design. Our canopies are manufactured from food-safe T304 stainless steel, and our ductwork is made from galvanised ductwork. This ensures safe, efficient extraction. Where required, which is usually the case, we also supply and install fresh air make-up systems to replace a percentage of the extracted air.

Extract canopies should be installed at a specific height and with sufficient overhang over the cooking appliances. This ensures effective capture of the cooking fumes and grease-laden air.

All our bespoke kitchen extract systems are designed to perfectly suit your specific commercial kitchen. We ensure our ductwork routes are sympathetic to your building’s structure and budget while providing maximum performance.

Gas Interlocking

When gas cooking appliances are used, it is essential that mechanical fresh air make-up is provided as a percentage of the extracted air, and the entire system incorporates critical safety controls:

  • Gas Interlocking: The system is interlocked to ensure the extract and fresh air fans operate simultaneously. This safety feature will automatically shut off the gas supply in the event of fan failure, system malfunction, or activation via the emergency stop button.
  • Control Integration: We can supply additional features such as fan speed control, BMS (Building Management System) integration, and fire alarm interlocking to meet all operational and safety requirements.


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Kitchen Extraction
Kitchen Extract and Fresh air
Roof Mounted AHU
HVAC Unit serving Hospital
Clean Room HVAC
System serving Clean Room
Central Canopy
Extract Canopy & Fresh air

Heat Recovery Ventilation Systems (HRV)

It is necessary that ventilation systems are supplied and installed in keeping with the ErP Eco-design Directive Lot 6 regulation. This ensures that they are energy efficient and do not waste valuable energy.

We design, supply, and install ventilation systems to incorporate Heat Recovery Ventilation (HRV) technology. These systems, utilising Air/Air plate heat exchangers, dramatically reduce wasted energy by reclaiming a high percentage of thermal energy as stale air is extracted and fresh air is introduced.

The ErP Eco-design Directive (2018) requires that heat recovery units are a minimum of 73% efficient. To meet this requirement, we design our systems not only to comply with the regulation, but—wherever possible—to significantly exceed its outlined criteria.

By using heat recovery ventilation (HRV), the energy extracted from outgoing air—whether warm or cool—is transferred to incoming fresh air. This helps maintain your building’s internal temperature during heating or cooling, while significantly reducing energy costs associated with ventilation.

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HVAC Systems

HVAC Systems (Heating, Ventilation, and Air Conditioning) are comprehensive solutions that integrate all the primary elements described within the system name. Unlike basic comfort cooling, which focuses solely on temperature, an HVAC system is designed to provide a complete air management solution that controls:

  • Heating
  • Cooling
  • Air Movement (Distribution)
  • Filtration/Purity
  • Ventilation (Fresh Air Exchange)


There are many types of HVAC systems, but they all overcome a varying array of criteria to ensure a comfortable room condition is met by providing adequate ventilation with integrated comfort cooling and heating.

A good example of the requirement for a HVAC system would be in commercial offices, hospital wards, and shopping centres where a specific and high ventilation rate or air change rate is required while ensuring the environment is simultaneously warmed or cooled to a comfortable set point. HVAC systems will often incorporate heat recovery ventilation technology to maximise energy efficiency during the air exchange process.

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Close Control Systems

Close Control Systems represent the pinnacle of environmental management. While similar to HVAC systems, their purpose is not merely to provide comfort, but to precisely maintain an environment within a very narrow band of conditions to ensure a change of state or condition does not occur.

Close control systems incorporate all elements of a Heat Recovery and HVAC system, as well as additional components to regulate humidity through the use of humidifiers and/or dehumidifiers.

The air conditioning systems incorporated into a close control system are engineered to achieve high sensible cooling and maintain an exceptionally narrow room temperature variation (e.g., ±1°C). In addition, these systems more often than not use advanced means of air filtration, such as the inclusion of HEPA filters, to ensure that the environment is not only maintained as a solid state but is also clinically clean.

A good example of the requirements for a close control system would be to serve data centres (server rooms), pharmaceutical manufacturing environments, hospital operating theatres, or swimming pool environments where humidity control is paramount.

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Other Ventilation Systems

We are also able to offer many other forms of ventilation system, such as:

  • Toilet Ventilation Systems
  • Supply air systems
  • Constant Velocity Systems
  • Pressurised Systems (clean rooms)
  • HEPA filters
  • Air Handling Unit Design / Supply
  • and many more

Contact Us or visit our Gallery pages for more.

Interested in finding out more?

We are able to design Air Conditioning and Ventilation installations for you. Why not visit our Design, or Contact Us pages to find out more.