HEPA filter for LAFWs

According to this formula I have a lot of questions.

Blockquote Q = V x A

  • Depth of HEPA filter is calculated for A (area) or not ?

  • Pressure drop is pressure differential ?

  • My problem is an air velocity in this LAFWs is 70 fpm (lower than criteria). If Q is fixed (control humidity in LAFWs) and A is also fixed (914 X 610 mm.), how can I increase V in this case ?.
    >> Decrease pressure drop across HEPA filter (Changing media : glass fiber to eFRM)
    >> Decrease depth of this HEPA filter that makes resistance of its low
    >> Overhaul this LAFWs (resizing)

                                                                                                 Thanks for ur kindness
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