Hi Terry Did you ever finalize this matter? We are experiencing the same problem with our Propane Fueled Gas Fireplace (a Regency) We had it cleaned & the same issue continues "WHITE DUST" all over the place on a daily basis Not experienced when we are not using the Gas Fireplace (in the Spring/Summer) I am concerned for our health due to the ongoing dust. To complicate matters we have 2 Golden Retrievers (perhaps some Dander is attributed to them), but this does not answers for the white dust/film that gets on the tables, walls, floors, eye glasses etc... I was hoping you got a solution Note: We have installed a Portable Honeywell Air Cleaner with a pre-filter & a Hepa filter - The dust still gets all over the place - Gas Fireplace has been well maintained over the years - Any help, Comments re- "cause" or a Solution would be appreciated