This Inline Duct Ventilation Fan spins at 200pa wind pressure and has an airflow of 255m³/H -150CFM, delivering air to the target location in a fast, fairly quiet manner. Ideal for grow tents, greenhouses, hydroponics, kitchens, bathrooms, basements, locker rooms, and garages to reduce humidity, purify the air, and lower the temperature in the grow room. Its lightweight, compact fan takes up little space and is suitable for situations where a larger fan cannot be installed. This ducted radon blower is designed for good air volume and works best with sub slab or sub-material conditions ranging from about 4 in. of clean, size 4-6 gravel to very loose soil. This Ducted Radon Blower is moisture and rust resistant and can be installed indoors on 4 in. 40-gauge PVC vent duct. NOTE: When installing this unit for radon reduction, any openings, major cracks, and penetrations in the building slab must be sealed. Retrofit blower sizing may require professional diagnosis and design. Material: Galvanized Aluminum.