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A version of this article appears in the May/June 2012
issue of Home Energy Magazine.
April 30, 2012
Long ago, when I started in this business, I wished for a pair of glasses that I could put on to see how the air was moving. (Now I wear glasses all the time just to see where I'm walking!) I still can't see the air movement without some sort of marker, like cobwebs, dust, or smoke. It is exceptionally useful for leak testing and combustion analysis to see how the air is moving, where it is going, and where it is coming from. Since we can't always get the spiders to build cobwebs where we need them, and dusty shafts of sunlight don't always penetrate into the basement when we are firing up a water heater, we need to rely on a device that creates a visible marker that can be carried around on the air currents.
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