Photos Illustrate Pirsig's "Zen Art Motorcycle Maintenance" :: USCA Science Building: 1)Passive Solar Energy Collectors, 2) Energy Saving Hoods in Labs & 3) Color Coded Ducts.

Chemistry Laboratory Fume Hoods Are Held High So Students Can See the Full Blackboard On Opposite Side of the Room.
Note White and Green Duct Pipes attached to top of hood box. The white pipe carries away the fumes while the green pipe delivers replacement air from outside the building. This reduces HVAC cost since the heated (or cooled) air from the room itself is not "sucked up" the hoods. The replacement air is delivered thru a screen full of holes just under where the sloping top portion of hood sticks out from the side of the hood.
Science Building, USCA Campus, Aiken, SC.
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(Photo = 4986 ...... WayPt = `000 |w|' 420 ft)