"Features of Trane 4 Ton Two Stage Air Handler
Comfort-R technology to increase efficiency
4-way convertible line ensuring flexibility
No-rust polymer drain pan & galvanized cabinet to protect the unit
Silent operation
SEET™ tested (Systems Extreme Environmental Test) for performance guarantee
Less than 2% air leak
Durable all-aluminum coil
Vortica™ blower motor ensures energy efficiency & low carbon emission
ComfortLink™ II or 24V Connections to increase overall efficiency & easy control"
https://greenleafair.com/product/trane-4-ton-2-stage-variable-speed-convertible-multi-3-4-hp-air-handler-tem8a0c48v41db/