Builder - September 2008 - (Page 51) HOUSECALL BRANCHING OUT: Where duct runs branch, triangular or square distribution boxes can be site-built to suit the need. DUCTWORK OPTIONS Airobatics Q: Insulated A: areforusually flexible ducts the least costly choice a heating or cooling duct STAN JOHNSON Heating and cooling contractors in my area can install flexible-duct systems for less than they charge to use metal duct or fiberglass duct board. But is it smart for me to choose that lower-cost option in a high-performance house? system that doesn’t perform as intended. So if you want quality— but at your best price—flex duct is a good choice; just be careful whom you choose as your HVAC installer. For more information on ductwork quality control, Builder turned to Stan Johnson, a secondgeneration HVAC pro who helped with a major overhaul of the industry’s national standard for airconditioning system design, ACCA Manual J—an effort that culminated in 2003 with the publication of Manual J8, the current version. Like most contractors in his market, Johnson relies on flexible duct for virtually every job. “There is absolutely nothing wrong with the flex-duct system,” he says, “as long as it’s designed properly and put in properly.” Flex duct costs less because it’s quick and easy to install, he observes. “But unfortunately, because it is so easy to do, people who don’t know what they’re doing think that they can just throw it up there. We see that all the time.” In Austin, Texas, however, a new municipal code requires all HVAC duct systems to be tested for leakage and correct airflow as part of the building inspection process. When you test (see page 52) President Stan’s Heating and Air Conditioning Austin, Texas www.stansac.com system. And yes, when they’re properly sized, laid out, and installed, flex-duct systems can perform as well as any system out there. But you have to be careful about quality control. Low-ball HVAC contractors who sell strictly on price usually install flex duct because it’s the cheapest product. But those lowestbid operators also tend to hire unskilled, low-wage helpers and cut corners on installation—and sloppy or thoughtless installation of any duct material can leave you with a courtesy stan johnson W W W.BUILDERONLINE.COM sep t e m ber 2 0 08 B U I LD E R ■ 51 http://www.stansac.com http://WWW.BUILDERONLINE.COM
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