This VIVOSUN 4-inch inline duct ventilation fan is a new vent blower designed for grow tent airflow setups. Listed with free shipping, it may suit buyers building or replacing a basic ventilation component for indoor growing spaces. The 195CFM model is intended for moving air through ducting, which can be useful when planning intake or exhaust in a compact tent system. If you are comparing options, the 4-inch size is an important buying note to match with your existing duct layout and accessories. This listing is best for shoppers who already know the fan size they need and want a straightforward replacement or setup part. Check the listing for full details. VIVOSUN 4" 195CFM Inline Duct Ventilation Fan Vent Blower for Grow Tent. Color: Black, Condition: New. Listed at 24.99 USD. We want you to feel like every item you get from us is the perfect match for your grow space. Can be installed in any location, such as bathrooms, attics, grow rooms, tents, or anywhere you need improved airflow.