The Horizontal Hi-Static Hideaway with Plenum (BPY) fan coil unit is designed for installations requiring a return air plenum with a unit-mounted filter and filter-rack assembly. The BPY plenum is constructed of galvanized steel and lined with glass-fiber insulation. BPY units are designed with interchangeable panels so that the unit may be modified on site to accommodate a read or bottom return. Standard BPY units are provided with a galvanized finish.