Air Vents in Flats

[AlwaysLearning]

I recently visited a purpose built block of flats over 6 storeys which was built c1970.

There is a single protected stairwell with 3 flats on each floor, each with a communal lobby of less than 4.5m accessed by two single fire doors.

There are manual openable windows on the protected stairwells.

Due to the age of the building and compartmentation levels being acceptable, would this also bee deemed acceptable due to the age and size of the building?

Any help as always greatly received.

 

 

[AnthonyB]

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