Intake side. The ceiling plenum takes diffusion media, typically a polyester blanket or panel set that evens out airflow across the working zone. On a value-line downdraft, intake media does double duty: it filters make-up air and it is the main defense against dirt-in-paint comebacks. Cheap out here and you pay for it in buffing labor.

Exhaust side. The low exhaust grids take arrestor media, with fiberglass pad or roll stock as the workhorse choice and paper-backed media as an option where waterborne loading or disposal preferences favor it. Because the record for this model does not yet document verified slot dimensions, we treat exhaust sizing as a measure-and-confirm step: count your grid openings, measure one frame, and we supply media to match.

Cycle math. The economics of a value booth live in the exhaust position. Arrestor media is the cheapest component in the booth and the most expensive thing to stretch, because a loaded exhaust raises booth pressure, pushes overspray into corners, and shortens fan and motor life. A standing filter program sized to your actual spray volume beats reactive ordering on total cost.

EPA NESHAP 6H applies to most collision and refinish shops spraying coatings that contain the target metals, and it requires the booth to be fitted with filter technology operated per the manufacturer's recommendations, with documented maintenance. OSHA 29 CFR 1910.94(c) sets the ventilation baseline: the booth must maintain adequate air velocity through the working zone, which a blinded exhaust filter directly defeats. NFPA 33 adds the fire-safety layer: overspray-loaded filters are a fuel load. For an EZ Modified Downdraft the practical translation is simple: keep dated records of every filter change and do not run media past its loading limit. Delivery records from a filter program serve as the maintenance log most inspectors ask for first.