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DIY air purifiers using a fan and Merv filter

HOW TO MAKE a do-it-yourself air-purifier by attaching a (replacement)  HEPA filter  intended for a furnace or a regular air purifier onto the   front   of a  flat-faced box fan  (or presumably other fan), for bedrooms or other places: https://smartairfilters.com/ en/blog/how-to-make-diy-air- purifier .....geeky stuff about  why putting filter on the  front  is better than on the back , which filterscapture/etc what, etc:   https://www.quora.com/Where- should-an-air-filter-be- placed-relative-to-the-fan- for-best-efficiency/answer/ Thomas-Talhelm   and: https://smartairfilters.com/ en/blog/what-combination-of- air-filters-do-i-need-to- protect-against-everything "Merv" is the designation used (for furnace/HVAC filters...one  brand ?) to indicate the rate the filter captures the lowest-micron sizes. " Merv 13 " is the highest rating, according to one person. They're also HEPA fi...
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Pleated Mask --with filter pocket, nose wire, ear loops

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NOTES : .... a few of the numbers in the pics  will be out of order due to mistakes when taking pics, but the step order will be correct   .... contrasting thread and nose wire used so would show up well   .... PICS ARE * ABOVE*  EACH WRITTEN STEP   pic 1 CUT OUT THE FABRICS … cut out 2 fabrics, each 8” x 8.5” (use a template as above, or a large quilter's ruler, or a regular ruler) pics 2 + 3 CREATE A FINISHED EDGE on each fabric where filter pocket edge will be    …  one at a time and wrong side up, fold each fabric over twice (1/4” each fold—1/2” in total) toward wrong side along the “bottom” (8”) edge, then iron … OR as shown in pic 2, make a cardboard/etc template with a 1/2” line marked across bottom, then fold fabric over bottom of template and up to the line; remove template and fold fabric to creased line, then fold over again (final double-fold will be 1/4” tall) (each fabric will now measure 8 x 8“)   pic 3 ...
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