Suspended timber floor vent

22 Sep 2022
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United Kingdom
Our 1970’s built house has suspended timber floors. In the lounge, we have this vent. Approx. 24cm x 9cm. We’ve got air bricks visible from outside, this vent is the only one in the house and about 2-3 metres away was the gas fire (now removed). What do we think - vent needed to be kept to ventilate under the floors and prevent moisture/rot under there, or a now defunct vent that was needed for the gas fire?
We’re laying new flooring, trying to work out if we can lay flooring over it or if I should be shopping for a new cover!
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