Thursday, October 18, 2012

Q&A: How Do I Determine Vertical Throw For a Grille When Catalogs Only Show Horizontal Throw?

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Vertical throw for supply grilles is not usually required since grilles mounted in a ceiling are not a normal application. But it sometimes ...

Q&A: I Need Performance For an Oversize Grille But I Can’t Find a Duct Area That Matches - How Do I Calculate Performance?

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1. Divide the duct area by two or more until you finda comparable duct area, and then multiply the throw by 1.4, this is a common constant f...

Q&A: How Do I Calculate Performance Data For Grille Sizes That Are Not Published in a Catalog?

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Most manufacturers have a selection software program that can help solve this problem.  The Titus selection software program TEAMS is avai...
Tuesday, August 21, 2012

Q&A: Compare Series vs. Parallel Fan-Powered Terminal Units

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There are two types of fan-powered terminal units - series and parallel. Every manufacturer offers both types and special variations such as...
Monday, August 13, 2012

Q&A: What is End Reflection and How Will Discharge Sound Ratings for Terminal Units Change in 2012

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There is an acoustical phenomenon known as end reflection that is regularly encountered in HVAC systems. It occurs whenever air flowing in...
Monday, July 16, 2012

Q&A: How Do You Size Parallel Fan Powered Terminal Units?

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Parallel flow (variable volume) fan powered terminals are selected based on their capacity to handle the primary airflow. The same rules whi...
Tuesday, July 10, 2012

Q&A: Why Are Filters for Terminal Units An Option?

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Optional filters on fan-powered terminal units are 1” thick disposable filters that are highly recommended if there is any chance that the...