If you are unsure about the cleanliness of your air system in the home or office, sometimes the best thing to do is remove the vent and have a look inside. If you notice dirt buildup on the vents or grillwork of your central air system, unscrew the grill, clean it, and have a look down the vent shaft with a flashlight.

You may be surprised to learn that what is coating your vents is "cosmetic dirt" which doesn't necessarily indicate a dirty central air system, but rather the usual accumulation of particles which gather over time. If you see blowing particles, this is a cause for concern, but if you inspect the ducts while cleaning your vent grillwork, you don't need to pay for a cleaning if you see nothing beyond the dirt you clean of the grill.

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