Step 1: Get parts together
- Piece of rigid foam insulation material or wood 5 or 6 inches (125-150mm) wide by almost the width of your window (minus a gap for weatherstripping). I used 1/2" (12mm) polyisocyanurate insulation board (the stuff with foil on both sides and rigid yellow material inside).
- Outside clothes dryer vent (I used a 4" (100mm) diameter vent kit) with inside trim ring
- Two pieces of sheet-metal dryer hose tubing for ends
- Piece of flexible dryer hose long enough to go from window to soldering area plus some extra length
- Computer fan (12VDC) small enough to fit inside the dryer hose tubing. If you're using 4" (100mm) dryer hose, you should probably use a 60mm fan. You'll want the highest flow fan you can find.
- Power cable for computer fan, and either a 12V lighter plug (if you're using this in an RV and have 12V power handy like I do) or a 12V power supply capable of powering the fan.
- Open-cell foam, at least 1" (2.5cm) thick and bigger than dryer hose
- Weatherstripping (1/2"/12mm) for edge of panel
- Bendable wire for legs (I used 0.105"/2.7mm suspended ceiling wire)
- Rubber bands
- hot melt glue, contact cement, duct tape, or other adhesive/tape to put everything together with
Look at what's included in the "dryer vent kit" in your local hardware store; it might contain all the dryer hose related parts.