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NADCA EXAM UPDATE EXAM STUDY REVIEW SOLUTION Bioaerosols - Airborne particles of biological origin Debris - Non-adhered substances not intended to be present that is located within the HVAC system Abrasion - A surface loss of material due to friction Access - The ability to gain entry to the interior of the air duct or HVAC component Access Door - Fabricated metal barrier (hatch) by which a service opening is accessed or closed Adhered Substance - A material, such as mastic, ...