Fantech FKD 16"with ec motor inline fan. This fan has very low hrs on it (probably less than 150) and is designed for commercial 24/7 operation with lifespan up to 10 years continuous use. The speed and airflow is variable with various controllers from simple dial to elaborate electronic controls that can hold temperature to a precise temperature. It is wired for 220 volts, draws 4.3 amps, cfm4250. Can handle airstream Temps to 140 degrees.
NEW ONE SELLS FOR $2700
ASKING $1500
I also have a duct silencer for it (16" ) that sells for $580 new . Asking $260.
If you need a powerful fan for anything this fan can do the job at half the price of a new one. Barns,greenhouses,kennels,etc.