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Simple Fan Fillter Box w/Allergy filter
The 17 Best Air-Purifying Houseplants (According To NASA)
top 10 air filtering places for indoors
Shop Fan/Air Filter
Replacing your furnace filter can help reduce dust. Good: standard fiberglass filters Better: pleated filters Best: pleated electrostatic filter
Box fan and air filter - you could make this cute with wood veneer on all sides and some cushioning!
sprinkle drops of vanilla, orange, lemon or almond extract on return air filter to scent your entire home. @ Do It Yourself Remodeling Ideas
making light boxes for stage sets out of air filters and duck tape
big air filter/cleaner for workshop sawdust projects in horse barns too.