When constructing exhaust fan housings, what material is acceptable aside from carbon steel?

Stainless steel is an acceptable material for constructing exhaust fan housings due to its excellent corrosion resistance and structural integrity, particularly in the high-temperature and potentially high-moisture environments typical of commercial kitchens. Stainless steel also possesses the strength needed to endure the mechanical stresses that can occur during operation and provides a smooth surface that facilitates cleaning and maintenance, which is essential for fire safety and hygiene in cooking operations.

In comparison, aluminum may be lighter and resistant to corrosion, but it does not perform as well in high-temperature applications and may not meet the durability and fire safety standards necessary for exhaust fan housings in commercial kitchens. Copper, while it is an excellent material for certain applications due to its antimicrobial properties, is not a common choice for exhaust fan housing due to cost and compatibility with other kitchen materials. Plastic is typically not used for exhaust fan housings because it generally lacks the necessary heat resistance and mechanical strength, making it unsuitable for the demanding conditions found in commercial cooking environments.