[Baharra]

I had also recently purcahsed an UltraSonic humidifier and in the past couple evenings have noticed a very fine foggy smoke throughout the house. Thought this was something that happened after the furnace was cleaned or something, but turns out, it was my humidifier. If I leave the humidifier off at night, the flame on the range is a nice blue the next morning, after running the humidifier during the day, the range flame is all yellow when I'm making dinner. I've done this two days in a row now. Today I'm going to leave the humidifier off all day and see if the flame is still blue this evening.

I guess I must have a defective unit. It's brand new, not dirty and not getting the house "too humid" - I've checked with a seperate Humidistat. Without it running the house is far too dry, but I can't have it making my flames yellow and who knows what crap it's putting into my air to make those flames yellow.

Thanks again for everyone's help.