Intended originally
for schools, this product became a common means for
ventilating all types of public and private buildings. a
Design Specifications:
VOLUME - 500 to 1200 CFM SIZES - 4
Construction Features:
A furniture steel cabinet housed the multivane fans,
filters and other parts which comprised
the unit. Placed against an exterior wall, usually beneath
a window, the fans drew in outside air,
or recirculated room air, then filtered
and/or heated it.