The Series 130 horizontal flow wall modules feature all metal construction to provide long life and maximum resistance to wear and abuse from abrasion, corrosion, stains, and chemicals. Well-designed cabinet volumes minimize weight and space requirements. The modules may be used individually or in groups to form a wall for a cleanroom or tunnel. Airflow is factory-set at a filter face velocity of 90 fpm. Other features include a protective grill for the absolute HEPA filter and a quiet, energy-efficient belt drive blower.