:The Rittal 3171.100 filter is a large prefabricated rectangular panel filter, measuring 173mm x 173mm, designed for filtering air with oil-based sprays and aerosol containing particles. It is constructed from rugged plastic-coated aluminum frames with specially designed filter media, providing durable protection and effective filtering. The filter comes in packages of five, and, when installed, they can be individually adjusted to meet air flow protection needs. The filter has an easy-to-clean design with an optimized filtration capability of fine, solid particles, and a removable bottom lid to allow for quick inspection and replacement of the filter media.