AC Infinity CLOUDLINE S4 4-Inch Inline Duct Fan

The CLOUDLINE S4 moves air through 4-inch ducting to exhaust an AV closet, rack room, or any enclosure that needs active ventilation rather than passive venting. A PWM-controlled EC motor drives a mixed-flow impeller across 10 speed steps set from the included controller, so airflow can be dialed to exactly what the space needs instead of running full-blast or not at all.

It is built on dual ball bearings rated for 67,000 hours, draws power from a standard 100-240V AC supply, and includes a 10-foot cord to the controller for mounting the fan up near the ceiling or duct run while the control stays within reach.