The 633rd Contracting Squadron at Langley Air Force Base, seeks feedback from companies/entities capable of providing and installing two 16 foot Big Ass Fans or equal with 2-foot extension tubes for c... The 633rd Contracting Squadron at Langley Air Force Base, seeks feedback from companies/entities capable of providing and installing two 16 foot Big Ass Fans or equal with 2-foot extension tubes for clearance (Ceiling Fan Kit, Powerfoil X4, 16’, 400-480V/3PH). Please see Attachment 1- Statement of Work for full list of specifications.