The complete source for building, designing, and remodeling green homes

Building Science
Benefits of HVAC Filter Grilles

Four reasons to design duct systems with filters at the intakes
Building Science
Improving Indoor Air With a DIY Portable Air Cleaner

You will need a box fan, MERV-13+ filters, cardboard, and tape
Building Science
Designing Return Filter Grille Boxes

The key is having enough space to minimize pressure drop

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