Mars® Air Curtains stabilize environments, and save energy by minimizing the heated/air conditioned air loss through open doorways. They also effectively repel flying insects, dust and pollutants. Obsidian black powder coated paint finish with variable speed controller. Environmental/Temperature Separation up to 8 feet - Insect Control up to 7 feet. Low Profile design at only 8" in height and very quiet. For doors up to 8'H. ETL listed 18 Month Limited Warranty. Door Limit Switch Sold Separately. 208 volts, phase 1, 30.5 amps. 36"W x 10-3/4"D x 8"H overall.