36" Inch Maxwell Comercial Air Curtain Sleek & Heavy Duty Design 115 Volt Field installed door limit switch included to accommodate for various type of applications. Saves energy by preventing loss of cool or warm air and maintaining temperature zones Powerful low noise air flow maintains temperature separation up to 14 feet door height. Keeps out dust, insects, smoke, fumes, odors UL listed and Certified for safety & 1 year limited manufacturer's parts warranty.