Rob64 Posted April 25, 2021 Report Share Posted April 25, 2021 In a circa 1987 five story block of older persons sheltered flats there are AOVs at the end of the corridors with OVs directly below them. As I understand it, current principle is the AOVs should only open on a fire floor to prevent ingress of smoke ventilated from a lower floor into a higher floor. Where there are OVs directly below the AOVs that are used for day-to-day ventilation and generally left open, this seems somewhat pointless. In these circumstances should the aspiration be for the OVs to be sealed / replaced by AOVs or is it the case that as the building was approved at the time of its construction it remains acceptable? Quote Link to comment Share on other sites More sharing options...
Tom Sutton Posted April 27, 2021 Report Share Posted April 27, 2021 I can see your concerns but check out https://www.members.labc.co.uk/sites/default/files/EXT.SCA-Guidance-on-Smoke-Control-to-Common-Escape-Routes-Oct2015.LSt_.v2.151116.pdf and see it this guide helps. Quote Link to comment Share on other sites More sharing options...
AnthonyB Posted April 27, 2021 Report Share Posted April 27, 2021 Are these in windows on an external wall? It's more of an issue with internal smoke shafts, where incorrect C&E on the system has led to rapid spread of smoke through all floors. Quote Link to comment Share on other sites More sharing options...
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