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Subwoofer Ported Box Design for 10 inch Subwoofer. Tuned for 39Hz

This is an air filtration unit that I have already build.
It consists of 2 filters, a 3rd one to be added.
HEPA F7 
HEPA H14
the HEPA G4 filter needs to be added.
It also uses a CA/LINE31 Centrifugal inline FAN
And at the exit, it has a 20mm thick 6.4mm hole opening  Aluminium Honeycomb. 
The Box is out of wood and actually is a crate :) 
The measured airflow at teh face is just below 1m/s

Cold box simulation for learning purposes.

BasePlate with box column and four bent dowels

stress distribution due to air flow
CFD
it is a box to protect sth

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