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Put down drop blast gates as close to the main duct as possible.  
 
Put down drop blast gates as close to the main duct as possible.  
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Use SRD-35 or ASTN D3034 PVC or 24 gauge spiral duct or thicker.
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Clearvue: Use SRD-35 or ASTN D3034 PVC or 24 gauge spiral duct or thicker.
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http://sveemetalworks.com/statistics/#lightbox/1/ says 8" 26 gauge spiral duct is good up to 30" WG with a safety factor of 3.  
    
Two 45 degree elbows has lower resistance than a single 90. Putting a short piece of straight pipe between the 45s is best.
 
Two 45 degree elbows has lower resistance than a single 90. Putting a short piece of straight pipe between the 45s is best.
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