Air brick cleaning

Cleaning out dust and anything that had gotten into the air brick will help keep the air flowing through the brick, as is its purpose.

Any blocked up air bricks should be unblocked/cleared using a long stick or rod. 

Related links/air bricks/ventilation/damp:

http://www.ukdamp.co.uk/environmental.shtml

http://www.haynes.co.uk/wcsstore/HaynesPublishing/images/PDFs/H5068spread4.pdf

http://www.diynot.com/forums/building/air-bricks-floor-vents-query.311069/

http://www.diynot.com/forums/viewtopic.php?t=247763

http://www.diynot.com/forums/floors-stairs-lofts/help-fixing-floor-joists-and-damp-in-victorian-house.376556/

http://www.petercox.com/sub-floor-ventilation.php