Airbrick in 1950 house opening to a vitrified clay pipe

9 Jun 2019
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United Kingdom

I am sure someone here has seen it before and could explain this to me. I recently unblocked (blocked by some insulation) an airbrick in 1950s house , which 'opens' onto a vitrified clay pipe under concrete kitchen floor. The pipe hoes for about 3 m all the way to the front room (where the floirs are suspended wooden floors).

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Most likely concrete floor was laid as part of an extension to the original 1950's house. The kitchen floor would have blocked the airflow from under the suspended floor in the front room. Air flow ( ventilation ) under suspended floors is necessary to avoid build up of damp.
As above, it will be a duct from the air brick to ventilate the void under the suspended timber ground floor.
Could also be ducted air for a fuel burning appliance in the room with a floor vent.
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good move to unblock it. Looks a bit damp. Hopefully it will dry out with the airflow.

Can you detect air movement?

Maybe have a look at your other airbricks in case any others were blocked.

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