Handling refrigerant, working with natural/propane gas, basic pipe-fitting, soldering/brazing, chillers (scroll, screw, reciprocating and centrifugal), walk-ins, reach-ins, package and split-system A/C's, ice-machines, air handlers, cooling towers, exhaust fans, make-up air (MUA) units, return fans, variable air volume (VAV's), re-heat coils, ductwork, heat-pumps, furnaces, boilers (hot water and steam), converters - high temp hot water (HTHW), medium temp hot water (MTHW), domestic hot water (DMHW), unit heaters (electric, gas fired, and hydronic) pumps, motors, motor starters, variable frequency drives (VFD's) motor control centers (MCC's), electrical disconnects, air compressors, air driers, electronic/pneumatic controllers , etc. However, employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information, unless the disclosure is (a) in response to a formal complaint or charge, (b) in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or (c) consistent with the contractor's legal duty to furnish information.