3 1/4 vs. 4x10x5 register end boot

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Old 04-16-18, 10:55 AM
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3 1/4 vs. 4x10x5 register end boot

Anyone know when I would use a 3 1/4x10x5" vs. a 4x10x5" register duct? Seen both at the store today and not sure if there is a reason to use one or the other. Thanks
 
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Old 04-17-18, 05:57 AM
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90 cfm vs 140 cfm but its a mute point because the 5 in duct coming into it is only rated at 60 cfm if noise is an issue go with the bigger. If its a big room and you need to throw the air more go smaller
 

Last edited by airman.1994; 04-17-18 at 05:59 AM. Reason: added info
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