The Windvent Principle »

As air flows around the terminal itself, positive and negative pressure areas are generated. On the positive side, air enters the louvres of the terminal and is directed downwards through the internal vanes and into the room below. The negative pressure on the leeward side of the terminal induces air to leave via the louvres, and taking with it the stale air contained within the room below.

We are certain you will see the benefits from this simple yet effective design principle, as well as the obvious cost saving implications upon the future buildings occupants. Not only is this system environmentally friendly, it is set to take the building industry by storm...

Are You Prepared for the Natural Revolution?

When calculating a Windvent system to suit your individual requirements the following criteria are needed for our design calculations to be effective:-

• Air changes required
• Room dimensions
• Location
• Average wind speed in area
• Average room occupancy
• Which direction are the windows placed (eg. south?)
• Heat gains within the environment for which the unit is to be placed

A Windvent cannot be manufactured or installed without these criteria being met.

Function – The Windvent is a natural ventilation system that operates on established aerodynamic principles. Where conventional room ventilation is difficult or insufficient the unit is able to deliver ‘fresh’ air into the room via the unit and controller. The windvent offers architects and consulting engineers not only a natural & environmentally-friendly solution but an efficient, economical and aesthetic answer to ventilation needs.

Balancing Effect – As air flows around the terminal itself, positive and negative pressure areas are generated. On the positive side ‘fresh’ air is introduced into the room via the louvres on the unit itself, whilst in the negative side of the terminal air is induced to leave the terminal thus extracting with it the stale air from the room.

Stack Effect – The overall process is aided by stack effect, ie. as cool air enters the windward side of the system it descends into the room below, and the warm stale air rises into the ducts facing the leeward side of the unit.

Wind Conditions – To allow for differing wind conditions and building requirements, adjustable dampers are provided with the system. These dampers are linked to a programmable control system, which allows for the ventilation rate to be controlled by room censors.

Control units can be set to leave the dampers fully open within summer months, when in the evening time the buildings are empty. By doing this stale air can be fully removed leaving a clean atmosphere within for occupants to have a ‘fresh’ start in the morning. In the winter months the controller is able to set the flow rate to reduce the effect of colder air diluting the warm atmosphere, whilst still performing its overall functionality.

Air Change – The principle of the Windvent system allows the provision of a fresh air supply, whilst maintaining a corresponding extraction rate without the need for a heavy power source other than a low voltage controller unit. Air change rates are determined by the building use, and calculated according to CIBSE standards and guidelines. The size and quantity of required terminals is based on the calculated air change rates.

Construction – The units are constructed from fully welded corrosion resistant aluminium, and are lined internally with acoustic insulation material. The units are manufactured in accordance with BS EN ISO 9001 and to suit most architectural design requirements. The adjustable dampers and discharge grilles are manufactured from anodised aluminium.

Colour Availability – The Windvent unit can be polyester powder coated following manufacture, to any specified RAL colour.

Designs – A computer generated likeness of the installed system can be reproduced for approval prior to manufacture. The size of the unit and number of louvres is dependent upon the air changes required and the building dimensions. For larger rooms a series of units may be required. Terminals can be designed to meet architectural requirements. Windvent louvres are designed to ensure that the maximum available free area of the unit is utilised.