Backdraft (1991)

Backdraft (1991), directed by Ron Howard and starring Kurt Russell and William Baldwin, is a firefighter drama set in Chicago. The film follows two brothers working in the same firehouse while a series of suspicious fires raises the possibility of arson. Combining large-scale fire sequences with procedural investigation and family conflict, the film balances action spectacle with character-driven tension. Known for its practical effects and intense set pieces, Backdraft became a defining 1990s emergency-services thriller.

Från IMDB:
Two feuding siblings carrying on a heroic family tradition as Chicago firefighters. But when a puzzling series of arson attacks is reported, they are forced to set aside their differences to solve the mystery surrounding these crimes.