Miyerkules, Mayo 27, 2015

Box Plenum - Entrance Fitting (to eliminate unstable air entering plenum)

Checking in, I've never used one of these on an install... Have you?
Name:  Hardi- Entrance Fitting Diagram.jpg
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Size:  40.7 KBHardi Tech Tip 42.pdf

Hardi Tech Tip (attached) describes its use, placement, sizing, etc.

Mocked one up on the work bench, or at least I started to; concerned about harmonics--for a 23" tall entrance typical sheet gauge warbles even with front and rear edges doubled-folded.

If you've seen one, or have thoughts on how useful one of these would be given practicalities, please post.
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