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Building Science

The Joy of Flex

A recap of my Building Science Summer Camp presentation

Getting flex duct right.This is the title slide from my flex duct presentation at Building Science Summer Camp in Westford, Massachusetts.
Image Credit: Energy Vanguard

I recently spoke at the Westford Symposium on Building Science. You may know it better as Building Science Summer Camp, since that’s what everyone calls it. I’ll fill you in on what you missed if you weren’t there.

Introduction

I gave this presentation with Chris Van Rite, who works for M&M Manufacturing in the Dallas area. We had given a presentation together (along with Robert Bean) at the beginning of this year at the ASHRAE conference in Las Vegas, so he got us on the Summer Camp program to discuss flex duct. He travels around Texas teaching contractors about duct systems and air flow and was on the ASHRAE committee that developed the new duct calculator showing the results for flex duct not pulled tight.

This was the first time I’ve spoken at Summer Camp, so I was a bit nervous. Before my talk I kept asking people if they’d take my place. One person even considered it seriously. When the time finally came for us to go up in front of 450 really smart people, I calmed down a bit. After Joe Lstiburek introduced us, I spoke first, then Chris spoke, and at the end, I came back to wrap things up. Here’s the video of my introduction. (Thanks to Joe Medosch for setting up his GoPro in the front row! Next time I should use a mic with the video.)

There it is. You’ve got all my best flex duct jokes now. (A couple of those are from my friend Mike MacFarland.)

Air resistance and Manual D

After the intro, I got serious and jumped into the air flow issues with ducts. Pretty much everything in my talk is something I’ve written about here, so I’ll point you to…

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