Air filters are essential components of any ventilation system, as they help to keep the air clean and free of contaminants. UL Class 1 and Class 2 air filters are two types of air filters that are commonly used in commercial and industrial settings. UL Class 1 air filters are designed to provide maximum protection against fire and smoke. When clean, these filters do not provide fuel when attacked by flames and emit only negligible amounts of smoke.
This makes them ideal for use in areas where fire safety is a priority, such as hospitals, schools, and other public buildings. UL Class 2 air filters are designed to provide moderate protection against fire and smoke. When clean, these filters burn moderately when attacked by flames or emit moderate amounts of smoke, or both. A Class II, Type A1 enclosure must maintain a minimum average entry speed of 75 fpm through the blade opening.
Class 1 and Class 2 air filters are both rated according to their Minimum Efficiency Reporting Value (MERV). This rating indicates the filter's efficiency in removing contaminants from the air supply. Pre-filters are typically used in multi-filter systems to trap dirt and large particles before the air reaches the final filters downstream, which then remove smaller particles. In conclusion, UL Class 1 and Class 2 air filters are two types of air filters that are commonly used in commercial and industrial settings.
Class 1 air filters provide maximum protection against fire and smoke, while Class 2 air filters provide moderate protection against fire and smoke. Both types of air filters are rated according to their MERV rating, which indicates their efficiency in removing contaminants from the air supply.
