Supplemental ventilation apparatus for manufactured housing

Claim 1

For use in a manufactured housing unit of the type having a roof and a ceiling spacedly therebeneath, whereby to provide room space below and attic space above such ceiling, there being an opening in such ceiling sufficient for passage of air therethrough, such housing unit having in such room space a downflow cabinet furnace of the type having in its upper portion a return air chamber, a return air inlet into such chamber, and an air circulating blower directing air from such chamber to a downflow outlet to such room space, the combination comprising A. exterior air intake apparatus including a supplemental, upward flanged opening into such return air inlet chamber extending through such furnace cabinet top wall, an adjustable damper in said supplemental opening, an outside air inlet through such roof, and a flexible duct leading downward from said outside air inlet and removably secured to said damper flange, whereby the room air circulating blower of such draws outside air through said damper to supplement the return air and thereby create a positive pressure in the room space, and whereby temporary removal of the flexible duct permits adjustment of the damper, and B. an outside attic air inlet and, spaced remotely therefrom, an attic exhaust vent having an exhaust fan, whereby operation of the attic exhaust fan creates a negative pressure in the attic space which, together with the positive pressure so created in the room space, withdraws air from the room space into the attic space for exhausting by the attic exhaust fan.