Architects love it for its looks and performance. They can use the Alstain ventilator to great effect in designing stunning looking buildings with the knowledge that it will perform exceptionally well as a natural ventilator. It is also highly adaptable:

they can have the ventilator configured to an exact millimeter width or height.

Consultants love it for its versatility. Besides using it as a façade element, they can use it as a smoke/air damper within a shaft system. Alstain is well suited to being both a smoke ventilator and a natural / day-to-day ventilator.

Building managers love it for its frugality. Easy to maintain, Alstain delivers an exceptional thermal and acoustic performance. Low operating costs plus high energy efficiency – what more could they ask for?



A Wide range of applications



The frame is manufactured from tough, corrosion resistant aluminium alloy, with stainless steel fixings.

Safe in operation Alstain has an optional anti-finger trapping control system.

Own manufacture Alstain CL is manufactured under strict quality control by Colt. Alstain is manufactured under the ISO 9000 quality standard. Each unit is given a functional test before despatch.

Aesthetic design Alstain uses narrow framework and projects only a small distance into the surrounding space. Narrower face frames also increase the geometrical area for the same size of opening and therefore the aerodynamic efficiency.

Motors can be hidden within the frame or are small in size. Our new Alstain has a bigger ratio of glazed surface to profiles as it has smaller frame face widths.

Design service Colt provides a pre-order design service. Please contact Alstain for more information relating to the application, specification, installation or servicing of Alstain.

High performance Alstain has high aerodynamic, acoustic and thermal performance, and has a high resistance

to the effects of fire. Full performance data is given later on in this leaflet.

Tested and certified


Alstain has been exhaustively tested and certified to EN 12101-2: 2003 as a dual purpose ventilator in accredited third party test laboratories and is CE marked. The ventilator is CE marked according to EN 14351-1 which guarantees its performance as a façade element.

High performance

in fire One of the architect’s main design considerations is to make sure that any smoke emitted by a fire is evacuated from the building in a controlled fashion. Special arrangements need to be considered, in particular for escape routes such as in stairwells. Alstain is very suitable for protecting escape routes since it has a high aerodynamic efficiency, opens quickly, has large openings and does not get in the way of people trying to leave the building.

Easy to install

and maintain

Alstain is delivered fully assembled to site into a structural opening or curtain walling. It must be installed in the vertical. It has

a wide range of base profiles to suit most sheeting or glazing applications. Easy maintenance afforded by allowing.

Louvre Technical data: