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Clearing the Air

For a less expensive filter, you can build the Area Filter shown on page 26. This version uses two bathroom exhaust fans, available at local hardware stores and home centers.

In addition to the fans, you'll also need a quarter sheet of plywood, one furnace filter, and some other supplies.

  • (1) 16" x 20" Furnace Filter
  • (1) Electrical Cord with Plug
  • (4) Wire Nuts
  • (2) Romex Cable Connectors
  • (1) "In-line" Cord Switch
  • (8) Ceiling Hooks
  • (1) Chain (length will vary)
  • (2) 3"-dia. Metal Ducts, 24" long
  • (20) #8 x 2" Fh Woodscrews
  • (12) #8 x l'/2" Fh Woodscrews

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