Engineer:
A key line item request was that the duct system be of the rigid pipe variety. Since our residence is single story with upwards of a 35 foot roof, this was a doable option, just more expensive than flex duct.
This was an important consideration for us, not an optional item. It was one of the key go/no-go consideration points for us when selecting a contractor.
Indeed, the contractor we agreed to proceed with stipulated a newly designed and installed rigid pipe system, with the exception of the last 6 feet being flex duct. We agreed to this (there are noise benefits to flex duct terminations).
What we got was a considerable flex duct system, unfortunately.
I don't want to debate the merits of rigid vs. flex - this is done continually over at hvac-talk.com. We simply wanted rigid pipe ductwork, were willing to pay for it, had it in the contract, but didn't get it.
Best regards,
Bill
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