Air handling unit with supply and exhaust fans

Air handling apparatus for blending an outside air flow and a return air flow from a building or other structure, said apparatus comprising;

• a housing having two longitudinally extending sidewalls, two end walls, a top, and a bottom and containing a divided air entrance section, an air mixing section, and a fan section, said housing also having a first inlet for said outside air flow to enter one side of said air entrance section, a second inlet for said return air flow to enter another side of said air entrance section, and an air outlet located in said fan section;
• first and second damper mechanisms positioned between said air entrance section and said air mixing section, each of said damper mechanisms comprising a multi-blade damper and a control mechanism for adjusting the blades of each damper to open or close air gaps formed between the blades, said first damper mechanism being capable of controlling the outside air flow into said air mixing section and said second damper mechanism being capable of controlling the return air flow into said air mixing section;
• an exhaust fan unit mounted on said top of the housing above said air entrance section and selectively capable of exhausting at least a portion of said return airflow to outside atmosphere;
• and
• an air supply fan unit mounted in said fan section which is located on a side of said air mixing section opposite said air entrance section.

Air handling apparatus for blending and conditioning separate air flows, said apparatus comprising;

• a housing having exterior sidewalls, a top and a bottom, and containing an interior space that includes first and second inlet chambers, an air mixing chamber, and a fan containing chamber, said housing also having a first inlet for a primary air flow opening into said first inlet chamber, a second inlet for a return air flow opening into said second inlet chamber, and an air outlet connected to said fan containing chamber;
• an internal partition mounted in said housing and separating said first and second inlet chambers;
• a heat exchanging coil unit mounted in said housing on a downstream side of said air mixing chamber opposite said first and second inlet chambers;
• a first multi-blade damper mechanism positioned between said first inlet chamber and said air mixing chamber and capable of adjusting amount of said primary air flow passing from said first inlet chamber into said air mixing chamber;
• a second multi-blade damper mechanism positioned between said second inlet chamber and said air mixing chamber and capable of adjusting amount of said return air flow passing from said second inlet chamber into said air mixing chamber;
• an exhaust fan unit connected to said housing and capable of removing said return air flow directly from said second inlet chamber;
• and
• an air supply fan unit mounted in said fan-containing chamber and adapted to deliver conditioned air from said air mixing chamber to said air outlet,
• wherein said first and second damper mechanisms are located at an end of said partition and are mounted on opposite sides of said partition.