Excellent Laminar flow hood instructions are available online, however, the filter mounting failed when using only silicone caulking.  I made these brackets to brace and mount the HEPA filter against the container.  ¼" holes with plastic bolts, nuts fix the filter to the container.

DIY Laminar Flow Hood Parts List

https://gordotek.org/laminarflowbox/

Assembly  Video

https://www.youtube.com/watch?v=lInfdAVvBts&t=989s