Feature 1OBLIQUE FLOW BOOST: The duct fan adopts high density diagonal blades, which can evenly cut air, reduce resistance, achieve optimal ventilation and effective air circulation. 2LOW NOISE: The booster fan collects airflow and reduces noise output, producing a noise level of no more than 30db, offering a quiet working environment. 3EASY TO INSTALL: 4 inch exhaust fan adopts separate body components, easy to install and disassemble, suitable for installation in various environments. 4IPX2 WATERPROOF: The vent blower features IPX2 waterproof grade, can maintain good performance in humid and harsh environments. 5HARD PP SHELL: The pipe fan shell is made of PP material, which has good toughness, anti aging, durability and long service life.Item Type: Duct FanMaterial: PPModel: YJ 100Power: 40WSpeed: 2550R Per MinuteAir Volume: 310m Per HourPerformance: Oblique Flow Boost .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Duct Fan4 x Screw4 x Anchor