@kumakaori74@kind.social In that case, there's always the CleanAirKits 6 fan plate: https://www.cleanairkits.com/products/brisk-box?variant=47660329173292 You can pair it with a 4-pack of 16"x25" Filtrete 2500 filters to make a more traditional CR Box: https://www.costco.com/3m-2500-series-filtrete-1-filter-4-pack.product.4000181409.html It still requires taping the edges, but the fan plate makes an excellent replacement for a box fan, as it's much quieter. With white tape, the whole thing looks pretty nice and cohesive - still less experimental looking than with silver duct tape.