Specifications include, but are not limited to: •All maintenance will be performed as per manufacturer’s requirements as contained in the O&M manuals available for reference in the District, relevant excerpts attached herewith. •Preventive maintenance includes filter changes and belt changes at the manufacturer recommended intervals. Classroom Unit Ventilators filters will be changed at least 3 times a year. •All work to be completed in a workmanlike manner. Site is to be left clean and free of debris at the end of each work day. •Preventive maintenance of A ERCO boilers include annual cleaning and startup and all necessary materials and supplies.•Lubrication of motor bearings, fan motors, and dampers where applicable