Free Vent Area Calculation
To effectively clear smoke at the appropriate rate, the recommended free vent area required from your window or windows is as follows:
Stairwell Windows: 1 square metre of free vent area at 90 degrees from the opening vent.
Lobby Windows: 1.5 square metres of free vent area at 90 degrees from the opening vent.
Windows should be bottom-hinged and open outwards, or side-hinged and open outwards, ideally positioned above the height of the door to ensure smoke is cleared above head height.
Other Products and Services from Rocburn Ltd
Natural Ventilation Equipment
If you are looking to create a passive ventilation system for your residential or commercial property, then we have a number of different products that can help you to achieve thi
Roof Hatch Stairwell Smoke Ventilation Kit
Our roof hatches meet all the requirements under BS EN 12101-2 making them certified for use in smoke ventilation systems. We’ll work with you to find the best delivery date with same day options available. We can recommend an installer for most parts of the UK. But if you want to handle that yourself, we’ll be on hand for technical installation support if required.
For a quick price or help selecting the right kit, why not fill in our enquiry form below and we’ll be in touch.
Natural Ventilation Controls
From the simplest of switches to systems that offer fully automated window control. We have a wide range of natural ventilation controls to suit any installation and actuator. Give us a call to discuss the best option for you.
Rocburn Ltd
Unit 5, Sutton Park, Sutton Road, Southend-on-Sea, Essex, SS2 5NX, United Kingdom
The UK's leading window opener and ventilation company, Rocburn Ltd, supply and fit a wide range of automatic and manual window opening and vent systems for domestic and commercial use. Designed to fit any window, whether it's a skylight, conservatory window, greenhouse, sash window or standard window our range of automatic and manual window openers are a must when trying to open widows that are too high to reach.