The surface mounted Guardian air curtain (https://www.reznor.co.uk/product/guardian-surface-mounted-air-curtains/) is the closest like for like replacement for AC air curtains. Due to the size of the casing on the Guardians, the dimensions maybe be a few mm different. Please view the manuals/brochure for more information.
What replaces the AC air curtain
Information about Reznor's range of air curtains.