Inspected furnace following customer concern about black filter after only one month of use. Performed diagnostic testing with UEi DL589 meter confirming 0.36A current draw, within normal parameters. Examination revealed some corrosion on metal components. Determined black filter was primarily due to customer's use of large candles rather than furnace or water heater issues. Verified power vent water heater and 2-year-old furnace are functioning properly with good combustion readings. Advised customer to discontinue candle burning and recommended electronic air filter and UV light installation for improved air quality.
