14 20 00 Elevators
14 21 00 Electric Traction Elevators
14 21 13Electric Traction Freight Elevators14 21 23Electric Traction Passenger Elevators14 21 23.13Machine Room Electric Traction Passenger Elevators14 21 23.16Machine Room-Less Electric Traction Passenger Elevators14 21 33Electric Traction Residential Elevators14 21 43Electric Traction Service Elevators