Is special filtration required if outdoor ventilation air is supplied through a duct directly to the air return?
Wind blown dust from fields or a dusty construction site finds its way into buildings and is a constant annoyance for homeowners. Our experience building in dusty places like Las Vegas, Tucson and Albuquerque has shown that complaints about dust on their countertops stop once the airtightness of the building is increased and mechanical ventilation systems are installed. In the recommended system configuration where an outdoor air duct is connected to the return, a “pre-filter” can be installed at the connection between the outdoor air intake duct and the return to the furnace. The “pre-filter” is mounted in a 12″x12″ register box with a slot cut in for a 12″x12″ filter at the outside air duct connection point. Typical forced-air systems have a filter on the return side of the furnace that does filter air drawn into the return. The additional filter allows for outside air to be pre-filtered before it is re-filtered by the main system filter. We recommend that the pre-filter be changed o
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