Our old redundant chimney/boiler flue leads to empty airing cupboard
downstairs. Theoretically it makes a great path for internal ventilation
however, natural operation of chimney means the open vent (12" square
hole) sucks whenever the wind blows.

Due to UPVC glazing etc, there is virtually no other air inlet
downstairs. Is it possible to replace the flue top (chimney bit) with
one that doesn't naturally exhaust when the wind passes over/through or
should I be looking at another way of getting air into the house?

Cheers
Pete
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