Hurricane’s Commercial Grade Inline Fan 4” 171 CFM is a centrifugal exhaust fan built for 4-inch ducting. A steel, powder‑coated housing and UL/ETL components support quiet, reliable operation. The fan includes mounting brackets and a 120 V power cord for fast installation, and is commonly paired with carbon filters, ducting, and ventilation controllers. Rated at 171 CFM (about 291 m³/h) in free air, it suits small tents, closets, or localized extraction where steady negative pressure is required. Approximate dimensions are 11.5 × 11.2 × 9.1 in and weight is about 8.9 lb. Typical uses include indoor gardening and general ventilation tasks requiring a compact, commercial‑grade 4-inch inline unit. The 4‑inch inlet/outlet size matches standard ducting and compatible carbon filters.