What the kit changes. A heat generator moves a lot of air through a burner or heat-exchange section, and that air has to be filtered before it reaches the heater. If your Endothermic Kit draws outside or shop air, there is a pre-filter stage in that path, and it cycles on its own schedule, usually faster than the booth's main intake media because it sees dirtier air.

The booth underneath. Spray filtration itself is unchanged by the heat package. On a cross-flow Saima layout that means intake media at the supply end (door or wall panels) and an exhaust grid of paint arrestor media at the far end catching overspray. Saima's catalog listing for this kit does not document slot counts or panel dimensions, and we will not guess at them. Measure one intake panel and one exhaust pad, or photograph the grids, and the WERCS service team cross-references the sizes against distributor and manufacturer catalogs before we build your kit.

Cycle logic. Heated booths tend to run more jobs per week than unheated ones; that was the point of buying the kit. More throughput means faster exhaust loading. If the booth has a draft gauge or manometer, change exhaust media on pressure rise rather than on the calendar, and inspect the generator pre-filter whenever you change the mains.

EPA's NESHAP 6H rule applies to most shops spraying coatings that contain the target metal HAPs: it requires spraying in a filtered enclosure with filters maintained and documented, and a heated Saima booth qualifies only while its exhaust media is intact and correctly sized. OSHA 29 CFR 1910.94(c) covers the ventilation side, and a plugged filter bank is the most common way a compliant booth drifts out of spec. NFPA 33 is directly relevant here: overspray accumulation near a heat source is the scenario the standard exists to prevent, so arrestor changes on a heated booth are a fire-safety task, not just a finish-quality task.