Christopher Morin's Blog – October 2012 Archive (1)

Building Code: ACCA Manual S

     A seldom practiced design procedure, equipment selection, has been part of the International Residential Code for many years, and local MA/RI code at least since 2010.  This critical step is the second part of residential system design, following a Manual J load calculation and prior to the Manual D duct design.  I think confusion around the dated manual has contributed to lack of use and enforcement.  Whether you are installing an air-conditioner, heat pump, furnace, or boiler, there…

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Added by Christopher Morin on October 24, 2012 at 1:00pm — 1 Comment

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David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Static pressure drop through a straight length of pipe is a function of friction rate, and friction…"
2 hours ago
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Apparently the air passing over the PVC creates a strong static field that in turn impedes air flow."
2 hours ago
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Why would you think PVC has high resistance?"
2 hours ago
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Thanks David - I was going to look at PVC for the HRV but was cautioned against it, not because of…"
2 hours ago
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Great post, Sean. I agree that screws are wise when joining metal ducts, but its also true that…"
3 hours ago
David Butler posted a discussion

Welcome Home Performance Forum Members (formerly RESNET BPI - Energy Audit and Home Performance)

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4 hours ago
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Various studies have indicated very little air flow along surface of duct (for ventilation - have…"
5 hours ago
Dara Bowser replied to Don Fugler's discussion joining ducts in the group HVAC
"Hi Don. We have never considered screws as impeding airflow, but I can see how in some ducts (e.g.…"
5 hours ago

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