A professional who assists workers engaged in installing, repairing, and servicing industrial, commercial, and residential environmental-control systems, performing any combination of following duties. Responsibilities include:

• Cuts, punches, flanges, shears, and solders sheet metal ducts and parts, using handtools and portable power tools.
• Cuts threads and packs pipes.
• Cements insulation in place over finished piping or tubing.
• Passes electrical wire through conduit, splices wire connections, and tapes wire.
• Assembles sheet metal components of prefabricated furnaces, using handtools.
• Replaces exhausted or defective containers of refrigerant with new refrigerant.
• Lubricates fans, motors, and control units.
• Installs air and water filters in completed assembly.
• Performs other duties as described under helper master title.
• May be designated according to type of equipment serviced as industrial air-conditioning-mechanic helper.