Windvent Design & Installations

Midtherm’s natural ventilation range offers extensive solutions to buildings’ ventilation and lighting requirements.

Midtherm’s design department, contract engineers and site installation teams are highly experienced and ensure projects comply with all statutory requirements and British Standards. Technical data is readily available for all systems using proven computer-aided sizing programmes.

Design

Terminals can be manufactured in keeping with the architectural aesthetics of the buildings to which they are installed, or alternatively, they can be designed and manufactured to give a contrasting appearance, adding a feature aspect to the overall structure of the building. Windvent louvres are designed to ensure that the maximum available free area of the unit is utilised.


Bespoke Design


Individual design requirements can be met, as our Windvents are manufactured in-house.

Manufacture

Our Windvent units are constructed in-house by experienced craftsmen and women. They are made from fully welded, corrosion-resistant aluminium and fitted with BSRIA tested internal acoustic and fire-resistant material. Adjustable insulated modulating dampers and transfer grilles are manufactured from anodised aluminium or perforated stainless steel panels, so they maintain weather integrity at all times. All units are manufactured to BS EN ISO 9001 and to suit architectural design requirements. They are also powder coated to your specification in any standard RAL colour.

Terminal Specification

Terminals are constructed from type 1050 AH14 pure aluminium of 2mm thickness minimum, making them highly resistant to weathering and chemical attack. Internal cross dividers are also manufactured from corrosion resistant aluminium. The units are manufactured in accordance with BS EN ISO 9001. Airways are protected by the incorporation of bird proof mesh to the terminal louvres.

Insulation/Acoustics

Open cell foam having a minimum thickness of 12.5mm is used in preference to mineral wool/glass fibre insulation, as it does not shed fibres or release particulate matter. The selected foam offers favourable acoustic performance and meets the necessary fire performance criteria. Please see BSRIA Acoustic Report (summary below). Data sheets can be made available on request.

Acoustic Report

Acoustic testing of the Windvent terminals has been conducted by BSRIA to identify the effects on sound dBA level in rooms benefiting from Windvent installation. Various acoustic materials can be introduced to suit the project requirements.


The report found that the ventilation system only raised the noise level 3.2dBA above ambient levels with the dampers fully open and by a negligible level when in the fully closed position.


We believe the heavy gauge, high density materials and acoustic products applied in our terminals currently lead the market in terms of performance. 


Additionally, terminals can be lined on the internal trunk of the system using different thicknesses of the fire-rated material to suit any acoustic requirements even libraries can benefit from our site specific designs. 

Information

Our natural ventilation and lighting units are constructed in house. They are made from fully welded, corrosion-resistant aluminium and fitted with BSRIA tested internal acoustic and fire-resistant material. Adjustable modulating dampers and transfer grilles are manufactured from anodised aluminium or perforated stainless steel panels so they maintain weather integrity at all times.


All units are manufactured to BS EN ISO 9001 and may be powder coated to your specifications in a standard RAL colour of your choice. Windvent units are acoustically tested to BSEN 20140-10:1992, BS EN ISO 717-1:1997 and BS EN ISO 140-10:1991.

How do I know how much air supply I will need?

Air change rates are determined by the building occupancy levels and are calculated according to CIBSE or BB101 standards. A low voltage controller unit then maintains this provision of fresh air and the corresponding extraction rate via temperature and CO2 sensors.

How many Windvents will I need?

The size and quantity of terminals required is based on the calculated air change rates. For larger rooms a series of units may be required.

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