The vent loks like the sort used to vent a gas water heater, space heater, etc. As such, it may include an inner sleeve for "out" and an outer sleeve for "fresh air in."
That coiled flex and "Bell" box look to be some design to allow the equipment to be operated fron some distance away. Is there another unit nearby that might work together with this one, and for which a serviceman might want to control from one point?
