Air Filters are available in either 2" or 4" nominal thickness and fabricatedwith galvanized steel frame and media. Other materials are available for stainless steel and aluminum Air Filters as a roughing filter where ease of cleaning is necessary. This filter is commonly used in electronic equipment, package air conditioning units, home heating and air conditioning central units and kitchen range hoods. Air Filters can be cleaned by soaking in hot water and detergent. After rinsing, allow the filter to dry and then recharge by applying