David Astorina's Groups (3)

  • Building Performance Institute (BPI)

    332 members Latest Activity: on Wednesday

    BPI is the nation's premier standards development, quality assurance and credentialing organization for residential energy efficiency retrofit…

  • Marketing Energy Efficiency

    253 members Latest Activity: Jul 21

    Sharing ideas, tools and examples of promoting energy efficiency to consumers

  • HVAC

    204 members Latest Activity: 5 hours ago HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part…

Latest Activity

Al Tibbs joined Bob Krell's group
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Healthy Indoors (IAQ)

The Healthy Indoors group is focused on indoor air quality (IAQ), mold, moisture control, radon,…See More
15 minutes ago
David Byrnes posted a blog post

Strategies for Hiring and Interviewing for Home Performance Professionals

Hire slow and fire fast.  It’s a phrase that experienced managers and human resources professionals…See More
58 minutes ago
David Butler posted discussions
1 hour ago
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…"
5 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."
6 hours ago
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Why would you think PVC has high resistance?"
6 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…"
6 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…"
7 hours ago

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