i made one from a hoover vacumm HEPA filter cartridge its rectangle about 2" x 12"
i use three screws into a plastic bilge vent cover and the shroud to hold it in place, best part is its washable
i think i have less than 20 dollars in it.
i dont have a pic, but will snap one later
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, #3998 no your eyes are fine, there are really 6 slides
2021 F250 or 2012 Edge toads