
Take just a moment and see if you can guess what this is a picture of?

At the bottom left of the picture is my flashlight face down on the floor. It is lighting up the space behind this heat register to reveal a fabric filter installed under the register. Filters in registers are common. However, a forced air furnace with an adequate filter will not need filters at the individual registers and they become just one more place that people will forget to maintain adequately.
If you “need” filters at the registers, you really need a better furnace filter.
But in this installation, the installation of the filter is NOT the most interesting thing (you probably knew there had to be something more). In this next picture you can see what the register looks like.

Ok, now change the filter.
By Charles Buell, Real Estate Inspections in Seattle
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