I’m retiring some vortex 6” that have a little over 10,000 hours on each one. Solid fans, motors are solid for the amount of use, but the shrouds on each end are leaking air. My fans never turn off once started on a grow and can’t afford a breakdown during. Quiet is nice, but not my biggest concern. Intake and exhaust fans are located outside of room and are independently controlled. Intake’s run at 50-60% capacity.