Why — other than “that’s the size of the hole in the unit”— did you need that 96” x 32” duct anyway when a 56” x 56” square or 60” round would have carried the air with the same friction loss? It’s ...

Using VariTrane duct design software, the entire supply ductwork layout to the variable-air-volume boxes was rearranged with excellent results using spiral lock-seam round. The 55,000-square-foot ...

Everything was fixed to the square scrubber with an even grid of duct tape, applied by Swigert as, step by step, he followed the instructions read out to him by Mission Control.