NADCA Vacuum Test (Analytical Method):
This method is used for scientifically evaluating particulate levels on non-porous HVAC system component surfaces. Using this procedure, a NADCA Vacuum Test Template is applied to the interior portion of the HVAC system duct work while a vacuum cassette with filter media is attached to a pre-calibrated air sampling pump. The open face of the filter cassette is passed over the two 2 cm x 25 openings within the template twice for a total tested surface area of 100 square cm. The cassettes are then re-sealed and sent to a third-party laboratory for analysis. CDA provides photographic documentation and cleanliness verification letter indicating either a pass or fail.
The video below is brief description of the above analysis method.