Whats the difference between a brush smoke seal and one with fins?
Brush seals were the first on the market (in fact, Lorient were the first to introduce them, back in 1979!), and hence they have popular appeal as the traditional smoke seal solution. Although they are still effective as smoke seals, the Building Regulations have moved on since they were introduced, most notably with new requirements in the last few years for doors to provide acoustic containment, and also be easy to operate to allow access for all. With so many doors now needing to conform to these new requirements, the brush-style smoke seal is simply not up to the challenge any more. Brushes are particularly poor at providing acoustic containment, as the brush fibres allow air to pass straight though, and therefore sound too. They also provide plenty of friction, which makes doors more difficult to operate. Fin-style seals provide a much more modern, comprehensive and indeed hygienic solution. They have better acoustic containment properties (particularly ones with dual fins) and mu
