DuraSteel Aerial Titan-2 36" Super Thin Alloy Anti Erosive Case Commercial Indoor Air Curtain - UL Certified - with Free Heavy Duty Door Microswitch (Limit Switch) UNBEATABLE CRAFTSMANSHIP - German electrical machinery promises 5,000 consecutive hours running of the motor. UL certified allows commercial use, which is reliable and safe ISOLATE THE INTERIOR FROM EXTERIOR AIR ENVIRONMENT - Powerful low noise air flow (110V-120V 60hz 450w, air volume648 CFM, air velocity3150 fpm) keeps the conditioned air inside and blocking 90% of Heat, Cold air, Dust, Insects and ect. Plus Hi/Lo/Off switch to fits your need. SAFETY IS OUR PRIORITY - Fireproof/rust resistant high-tech aluminum and ABS case reduces the possibility of damaging. Easy to clean and protect your healthy life. PLUNGER MICRO SWITCH - The door pushes the rod on the switch to trigger air curtain on/off automatically, which extensively prolong the life of usage. FRIENDLY SUPPORT - With Instruction manual, installation should be easy. But if you have any issue on installation or product, we will provide help tirelessly to insure your enjoyable experience. Titan 1: 110V-120V 60hz, air volume: up to 2119 CFM, air velocity: 3150 FPM, Nosie: 65 dB minimum Titan 2: 110V-120V 60hz, air volume: up to 1118 CFM, air velocity: 3150 FPM, Nosie: 50 dB minimum