backdraught

US and Canadian backdraft

noun

a reverse movement of air, gas, or liquid
an explosion that occurs when air reaches a fire that has used up all the available oxygen, often occurring when a door is opened to the room containing the fire

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