Question about installing a damper

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  #1  
Old 07-14-16, 08:36 PM
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Question about installing a damper

I have a town home. The kitchen register in the middle floor blows waaaay too much air. It's very powerful. The register is on a 10 foot straight run directly off the HVAC unit. The outer diameter of the duct is 19" round. I want to cut it, put a circular damper in it, then tape it up. The outter diameter is throwing me off here. The biggest damper I can find is 8". Will that size work? Am I going about this wrong?


Thanks!
 
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Old 07-14-16, 09:13 PM
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Are you measuring the circumference and not the diameter? 19" is about the circumference for a 6 inch diameter duct, which would be most common in residential applications.
 
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Old 07-14-16, 11:05 PM
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AHH!!!! Duh, I knew I was having a major brain malfunction. I look at a 3 inch pipe for example and think, yeah that's 3", I never stopped to think if I measured around the pipe it would actually be 9.42". And since the duct is intact, I couldn't eyeball the opening and measure across so I measured around. Wow high school geometry flooding back now. Thanks!
 
 

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