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In the Living Areas
To investigate these areas, you will need a draft detector.
So...
 

QUICKIE EXPERIMENT “A”
Making a Draft Detector

     Cut out a piece of clear plastic food wrap about 5” x 10”. Tape the 5” end to a short stick so the long end hangs freely. For the stick, you could use a pencil or ruler (but a baseball bat probably wouldn’t be a good idea).
     That’s your draft detector. Notice that even when you blow ever so lightly, the plastic detects the movement of air.