According to DuBois-based State Police, the fire caused heavy damage to a single story residential duplex located at 48 1/2 Main Steet around 4:55 p.m.
The State Police Fire Marshal and Falls Creek Fire Department investigated and determined the fire began in a utility room.
The cause is still being investigated.
One firefighter was treated at Penn Highlands for smoke inhalation. The name of the firefighter was not released.
Damage was estimated at $150,000.
Fire companies from Adrian, West Sandy, Brockway, and Reynoldsville reported to the scene.
DuBois EMS also responded.