Yeah it's called a backdraft. I believe it happens when a fire has used up most of the oxygen in the room and just kind of lays dormant like coals in a campfire and then when oxygen is intoduced there is an explosion due to the fire being fed oxygen at an alarming rate. Some say you hear a whistle as the air rushes in and then the explosion. Hopefully this opens the house to air prior to that condition and allows all living occupants to get out safely. I will have to do some serious research into fire situations in a home to dial in this invention. Great comment Dave thanks.

It's awesome of you to be thoughtful of your pets and I hope you come up with something safe :)

Wouldn't an open door mean more oxigen for the fire to burn faster? I remember seeing in a documentation that in some cases an explosion was triggered by opening a window because of the sudden extra air flow.

Then in it is extra easy for her to leave the house in shame :D