No one has been reported hurt after a fire in Hull Wednesday morning.
Firefighters were called to a multi-unit walk-up at 660 Cité-des-jeunes Boulevard at around 7:30 a.m.
Fire officials believe a faulty air exchanger may be to blame.
The fire did about $50,000 worth of damage.
No one has been displaced, but the Red Cross is assisting one of the 11 people living in the building.
CORRECTION NOTE: This is a corrected story. A previous version said a faulty air conditioner was suspected in the fire, but firefighters suspect a faulty air exhanger unit.