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4 storey building (G-3rd floor), single stair way with lobby protection to flats on each floor. The AOV on the third floor roof is within the protected lobby. Surely the FD30s door negates the AOV from clearing smoke from the stairs? Would you recommend removing the door? Thanks in advance. 

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  • 3 weeks later...

Thanks for the replies. Should’ve pointed out the stairs are enclosed with no OV’s. Ventilation of the stairs would only be possible by FRS intervention by PPV and wedging the top floor door with AOV open.  Just seems odd it was installed for a lobby the area of 3m x 1.5m and not the stairs where all flat occupants would benefit from.   

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