What MERV/HEPA rating should I buy for a DIY flow hood?

Use a true HEPA rated ≥99.97% @ 0.3 μm (H13) or, ideally, H14 (99.995%). Pair with a balanced blower to achieve laminar flow ~0.45 m/s (90 ft/min) at the face. Add a prefilter to extend the HEPA life, and seal all joints to prevent bypass.

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