These folks are mostly known for jet-pulse bag house filters - industrial dust collection.
Any 'process filters' offered would most probably be 'private branded' cheap knock-offs from asia or eastern europe. Lots of that 'chicanery' going on in many industries and with many products.

Caveat emptor, unless you are fully versed in the jargon of 'filter-speak'. Probably every 'filter distributor' in the USA, unless owned and controlled by an ethical filtration manufacturer, offers such because of the incredible 'margins' these cheap knock-offs represent. Beware.