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Gilberts (Blackpool) - Natural Ventilation Systems

Natural Ventilation Systems - Stack Ventilation - Mistrale - Air Distribution

Natural ventilation, unlike mechanical fan forced ventilation, simply uses the naturally occurring pressure differential forces of air movement, wind and buoyancy to deliver a steady supply of fresh air for building ventilation and space cooling.

In an age where energy conservation is at a premium, this sounds ideal… And so it is!

Naturally ventilating a building can offer the best of both worlds, combining little or no energy consumption with low capital costs, whilst still providing adequate fresh air and comfort temperature conditions throughout the year. With plant room also eliminated, services space minimised and lower servicing/maintenance costs, natural ventilation now makes for one of the most practical choices of the day.

Natural Ventilation Strategies

Gilberts’ Mistrale is designed to satisfy wind driven, buoyancy (stack effect) and hybrid wall or façade ventilation design strategies.

Stack Effect

A conventional solution where a vertical stack or shaft can be used to allow warmer air to naturally migrate and rise through the building up to high level outlets whilst drawing fresh, cool air in from low level.

Wind Effect

In some locations and building designs, wind alone can be used as the principal driving force. In wind driven systems, the air on the windward side of the building creates positive pressure with a corresponding negative pressure generated on the leeward side. Using this effect, air can be more easily drawn through the building.

Fusion Mixed Effect

One of the latest innovations in ventilation is our Fusion cassette which is able to provide an extremely low cost ventilation solution from a single façade, with the added benefits of heat recovery. Mistrale Fusion is a hybrid style of natural ventilation incorporating an ultra-low power fan assistance feature, able to energise in poor air movement conditions to ensure adequate ventilation at all times.

A standalone system, Fusion can provide adequate ventilation and cooling without the need for supportive systems such as opening windows. Achieving the 8 litres/sec/person fresh air required by the current Department of Education Building Bulletin (BB101) and PBSP Guidelines, Fusion is engineered to absorb noise in keeping with BB93 Classroom Criteria. It also remains compliant with Building Regulations Approved Document L: attaining air leakage better than legislative requirements - 5m³/HR/m², and a U-value of 1W/m²/°C.

Benefits of Natural Ventilation

  • Energy savings through reduction in cooling energy
  • Reduced capital cost
  • Quieter sustainable building
  • Healthy building conditions due to ample fresh air supply
  • Simple, reliable & robust
  • Low repair & maintenance costs
Gilberts Mistrale Logo

Mistrale Design Solution

Mistrale is a complete natural ventilation air distribution solution comprising louvres, volume control dampers, internal grilles and rooftop turret louvres with installation options encompassing windows, walls, floors and ceilings. Designed by air distribution experts for dependable performance, the latest innovation is Mistrale Fusion, a hybrid unit providing a single wall or façade natural ventilation solution with both heating and heat recovery features.

Key Features

U-Value: As low as 0.96 Watt/m²/K

Leakage: As low as 5m³ per hour per sq/m

External Weather Rating: Up to Class A (BS EN 13030)

This high design standard and flexibility makes Mistrale the ideal partner for your next natural ventilation project.

Click the PDF image to view the technical information in full


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Gilberts (Blackpool) Ltd
Clifton Road

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Tel: 01253 766911
Fax: 01253 767941

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