Francisco and Rolando were good workers. They arrived about 10 a.m. and worked diligently all day at assembling and installing the new gas fireplace unit until about 6 o’clock or so. It was well after dark when they finished, cleaned up, tested the unit and showed us how to operate it. They took a picture of the completed unit and soon left. We still want to know how to operate the unit with batteries in the event of a power outage. We have not yet received a builders permit from Fairfax County so that we can schedule inspection by the inspector.