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The objective of this Indefinite Delivery Indefinite Quantity (IDIQ) is to obtain Mechanical Maintenance services for the Cold Region Research Engineering Laboratory (CRREL) over the next five years. Mechanical equipment to be maintained includes, but is not limited to, the following: heating, ventilation, and air-conditioning systems; humidity control systems; fume hoods; environmental chambers; special laboratory equipment; pneumatic controls, electronic controls such as DDC and SCADA systems industrial refrigeration systems, gate operators, vehicle barriers, research cold rooms, reverse osmosis and deionized water systems, ductwork, air compressors; vacuum systems, filters, overhead doors, and other mechanical systems.