Heating, ventilation, and air conditioning set included air ducts, air conditioning units, floor vents, and animated fans. Non-recolorable pieces, useful for adding that sense of realism to buildings. No picture this time, sorry.

This is an update to a set created in August 2008.

Download and view thread here:
http://www.ataricommunity.com/forums/showthread.php?t=653866