The OA600 Pro is made from aircraft-grade aluminum. The unit's riveted housing stands on hospital-grade non-marking casters to ensure effortless portability. Meticulous sealing of all critical seams with silicone before and after riveting ensures an airtight path. No contaminated air circumvents the HEPA filter. Additionally, the OA600 Pro features an easy-to-clean aluminum surface that will withstand the abuse often doled out on demanding job sites. With its adaptable nature, the OA600 Pro model provides a variety of options concerning pre-filters, HEPA filters and related add-ons. The baseline OA600 Pro setup includes a Dustlok pre-filter and an exceptionally effective 99.99% HEPA filter. Dustlok pre-filters incorporate an antimicrobial element to hinder bacterial proliferation.