Vevor Air Curtain 42" Commercial Indoor Axial 2 Speeds 1350CFM 110V Unheated NewVevor's powerful Air Curtain keeps your space comfortable all year round. Block out bugs, dust, and unpleasant smells with a wall of air that will keep your indoors fresh during hot and cold months. Switch between two fan speeds to adapt to the seasons. The low speed provides energy efficiency and minimal noise, while the high speed setting provides robust isolation, blocking out pollution and maintaining indoor temperatures.