Pipe replacements produce savings, greater productivity at Ohio laundry facility. 

In the second of two parts, the author discusses why he feels the the building industry needs to re-evaluate the usefulness and cost effectiveness of Return Air Plenums. Do they increase the cost of construction and decrease the healthiness and safety of our buildings?

The advent of air conditioning a century ago brought us into a new era, the AC in HVAC.  While heat could be delivered in various forms into a space, cooling came in one medium - cool air. The more, the better. Somewhere you had cooling coils to create this new-found luxury, and fans and ducts to deliver the valued commodity to the place it was needed. Once the cool air had severed its purpose, it had little value.