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| Aspegillus has a particle diameter of 3.5 micron. If it becomes airborne it may be removed by a MERV 9 filter when matched with a proper number of air changes. |
Mold spores are carried by air currents and predominate in the summer and early fall. In warm climates, they thrive year round. Cutting grass, harvesting crops, or walking through tall vegetation may provoke an allergic reaction. Molds, mildews, bacteria and dust mites, all sources of allergic reactions within our species, like the same environmental conditions that we do, warmth and moderate to high humidity. Mold need little more than a constant moisture supply for survival. Water damaged carpets; ceiling panels, walls, and paneling are prime sites for new growth if they are allowed to stay damp. When molds and mildew are disrupted, they release their spores into the air and the resultant is a bioaerosol formation.
Mold and mildew may be found in the ductwork of any HVAC systems. If there are leaks in the ductwork, or places where moisture and outside air get into the system, mold and mildew can grow. They can be found on the coil of an air conditioner or in the connection between the unit and the ductwork. Moisture problems are worse where ductwork insulation is on the inside as opposed to the outside of the duct. The insulation's porous surface collects dust and moisture. Mold and mildew may also grow on dirty air filters.
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