All outdoor intakes, housing, plenums from point of entry into the
building to the fan or supply discharge and to exhaust duct from
damper to outside and elsewhere be indicated on drawing are insulated
with 1 1/2 inch rigrid insulation board w/ vapor barrier, as per
specification.
All exposed conditioned supply ductwork with in the building is
insulated with 1 inch thick rigid insulation bord with vapor barrier.