Where there’s smoke, there’s fire. It’s just a saying, but the Spokane Fire Department, the Red Cross and students from Gonzaga University think it could save lives. This weekend, volunteers from those organizations will canvas the Logan neighborhood, knocking on doors and checking for homes without smoke detectors. Their work is part of National Fire Prevention Week, and if they find a home in need of a detector, they’ll either install it then or come back in a couple of weeks to install one, free of charge.