Instructables

Step 2: Build duct flanges from empty food cans and leftover containers!

Picture of Build duct flanges from empty food cans and leftover containers!
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Large empty food cans (28oz) are close enough in diameter to be re-purposed into a great adapter for standard 4" flexible dryer duct hose.  Tin snips or well-made, heavy-duty poultry shears easily cut through the can.  Combine with a standard square disposable 25oz plastic leftover / freezer container and some generous beads of hot glue to seal the deal, and for around $1 you have effectively built a dryer duct flange.  Keep the container lid handy as we will use it later as an an air-tight coupling mount on the back of the catbox.
 
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