Safety

 WARNING: Do not operate the air handler system without filters for extended periods. A portion of the dust entrained in the air may temporarily lodge in the air duct runs and at the supply registers. This residue can soil ceilings, walls, drapes, carpets, and other household articles.

 WARNING: Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing. Failure to follow this warning may result in personal injury.