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Box fan and air filter - you could make this cute with wood veneer on all sides and some cushioning!
Shop Fan/Air Filter
The 17 Best Air-Purifying Houseplants (According To NASA)
top 10 air filtering places for indoors
Light boxes made using air filters, cardboard, duct tape and led lighting. Awesome, practical and cost effective.
making light boxes for stage sets out of air filters and duck tape
indoor plants which are most effective at filtering these harmful toxins and pollutants from the air
air filters, black duct tape, lighting, super easy!
Sprinkle drops of vanilla, orange, lemon or almond extract on return air filter to scent your entire home.