Inspect and test steam and hot water systems, fire and sprinkler systems, compressors, and air and exhaust system, cycling and functioning of gauges, valves and controllers to determine maintenance needs; install, inspect and repair water lines, sewer lines, and air and gas lines; repair and maintain boilers, refrigerators and air conditioning units; repair sheet metal structures,  repair electrical lines and control apparatus;  layout, install and remove hard and soft surface floor coverings; build or assemble shelves, hang doors and paint walls; read and interpret blueprints, diagrams, sketches, and job specifications to locate machinery or ducts and to apply manufacturer's instructions and repair procedures; braze, solder, and weld pipe, sheet metal and fixtures; remove, replace or r