Residential, Townhouse / Condominium Sprinklers control air conditioning unit fire at townhouse (Maple Ridge, BC) August 8, 2012 viking210 A fire caused by an exploding air conditioning unit was quickly doused by sprinklers after its spread to a townhouse. Fire chief Dane Spence said a fireball came through a window. “The sprinkler system went off inside and kept the fire to the outside of the residence,” said Spence. No one was injured in the fire.