Another important consideration relates to the ability of the system components to withstand +ve & -ve pressures. I have seen an air handler collapse because an inlet damper was shut during start up. The casing was tested to withstand in excess of the fan +ve discharge pressure only. If the...
From my experience the air when exiting the perforated face of the diffuser combines to give a measurable velocity around 1 foot from the face. As the air travels downwards it will start to peel off at the outer edges of the diffuser canopy (hopefully forcing any airborne particles away from the...
