Product: Fantech FR 100 Inline Centrifugal Duct Fan, Molded Housing, 4"
Brand: Fantech
9 sizes with airflow capacities between 150 and 650 CFM
Vibration welded seam ensures leak proof housing
100% speed-controllable
Air stream temperatures up to 140 °F
They are also widely used as booster fans to move air from one room or area to another.

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