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airbrick

British  
/ ˈɛəˌbrɪk /

noun

  1. a brick with holes in it, put into the wall of a building for ventilation

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Discounted premiums also will come for households that have fitted property flood resilience measures, such as airbrick covers or non-return valves.

From BBC

It is possible to protect houses against flooding with simple measures such as airbrick covers and sandbags.

From The Guardian