Ducting blocks

stumbler69

Active Member
Alright, I saw these on some website a while back and cant figure out what they are called or where to find them

Basically it looks like an inline fan, but instead of a fan inside there is a valve, so when 120v is applied the vent opens allowing air through. Anyone seen these before?

Im trying to cool 2 cabs and keep humidity in check with one inline fan...
 
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