The Mars STD242-1UA-OB 42" unheated air curtain is a cost-effective solution for commercial kitchens and restaurants seeking to maintain temperature control without blocking walkways. This unheated model features a powerful 1/2-horsepower motor that delivers strong airflow while minimizing energy consumption, making it an efficient choice for climate-controlled environments like walk-in coolers or freezers. Its automatic on/off function—activated by the 99-014 door limit switch—ensures uninterrupted operation without manual intervention, reducing labor costs while keeping contaminants out. The rust-resistant, powder-coated metal housing enhances durability in high-traffic areas, while adjustable air vanes allow for precise airflow direction, ensuring optimal performance. Perfect for doorways measuring 10 to 12 feet, this air curtain is designed to fit seamlessly into commercial kitchen setups while offering long-term reliability with a 5-year parts warranty.