- Drill and bits
- Saw-power or hand
- Framing square
- Saber saw or keyhole saw
- inexpensive solid-core replacement door to fit door opening
- latch set and hinges to suit door (or re-use from original door)
- bathroom-type box fan
- furnace filter
- poplar or maple 1 X 2s
- 2 - 4' X 8' sheets 1/4" luan or birch plywood
- 2-1/2" drywall screws
- 4d finishing nails
- carpenter's glue
ConstructionThe diagram should be self-explanatory. Dimensions are not given, since they will vary with different doors. The vent consists of two identical 1X2 frames attached to opposite sides of the door with screws driven through pilot holes and glue. Be sure to allow enough space around the frame for the door to open, and for the doorknob to be accessible. Caulk the area where the door and frame meet.
Opening are cut through the door more or less as shown. The area inside the frame is painted flat black, and caulked. Two identical sheets of plywood are cut to fit the frames, with two openings cut through each sheet as well. The inside surfaces of the plywood are also painted black. The plywood is attached with glue and finishing nails. Build frames to suit the box fan and furnace filters, and position over opposite vent openings.
The fan can be operated by an extension cord to an outlet, or it can be wired permanently using flexible armored conduit.
Dale Austin firstname.lastname@example.org
All images and text copyright 1977-2003 Dale Austin