Update: Need to remember that air will flow to lowest pressure point, so how do we achieve a good spread of the coffin incoming air across the filter itself?
Ideally would fit under bench within a space of 1400mm (w) x 530mm (h) x 700m (d)
Filter and Fan would fit within a 350 mm square x 750 mm height. Box will likely lay flat on its side
Plywood sourced is 12mm x QTY 2 sheet of 1200mm x 600mm.
Sheet 1 would fit 3 of the Coffin sides 350 x 750 and Sheet 2 one remaining side and top and bottom of ‘350’ x 2.
Note I haven’t decided upon box fit and opening but if working from something like below I might have the box seal by the top fitting over all 4 sides, press-fit with togggle catches also, avoiding the need for a hinge altogether.
Is it best to locate fan inside coffin to minimise noise?