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How can i choose the size of the square air diffuser 9x9 or 15x15 or 18x18?

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Question added by Hany fayz
Date Posted: 2015/06/16
magdy abd al nour
by magdy abd al nour , HVAC Site manger , First United Co.

according to the cfm we need from that Diffuser,,,,we the cfm we choose the right size that make acceptable NC and friction .

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