Heroes of the Flames (1931)

Fireman Bob Darrow invents an original chemical fire extinguisher, and his rival, Dan Mitchell, for June Madison, also has his eyes on Bob's invention.
Chapter 1: The Red Peril, Chapter 2: Flaming Hate, Chapter 3: The Fire Trap, Chapter 4: Death's Chariot, Chapter 5: The Avalanche, Chapter 6: The Jaws of Death, Chapter 7: Forest of Fire, Chapter 8: Blank Cartridges, Chapter 9: The House of Terror / The House of Horror, Chapter 10: The Depths of Doom, Chapter 11: A Flaming Death, Chapter 12: The Last Alarm.