Natural Smoke & Heat Ventilators

What are NSHEVs?

Natural Smoke and Heat Ventilators, NSHEVs, consist of two elements tested as one unit. They comprise an opening vent - a window, louvre or dome light - and a driving mechanism, normally a chain actuator or rack and pinion drive.


What is BS EN 12101-2 British Standard?

BS EN 12101-2 is the European product standard for NSHEV's.
The standard defines test parameters and replaces BS 7346-1, the UK's previous standard.

Solutions, standards, independence

Our knowledge of certification is second to none. We partnered with D+H Mechatronic to play a central role in formulating EN12101-2 standards. We have co-operations with many system houses and fabricators to test systems in all kinds of applications for full certification.
Dyer offers the UK's widest range of
BS EN12101-2 certified solutions

• widest choice of tested systems for facades and roofs
• compatible with many drives
• choice of concealed drive solutions
• large vent sizes available
• tested for high winds and snow loads
• high aerodynamic figures due to provision of large opening
angles and distances.

Fully tested systems

We'll guide you through the certification process to ensure your NSHEVs have the security of full CE accreditation. We're also an independent supplier, so we can create the optimum solution for you.

Learn more at CPD seminars
Our NSHEV expertise is second to none. Learn more about NSHEVs at our CPD seminars >>



DYER Environmental Controls Ltd, Unit 10, Lawnhurst Trading Estate, Cheadle Heath, Stockport, Cheshire SK3 0SD ....T: +44(0)161 491 4840 ....E: