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AOVs and OVs


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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? 

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