"Pacific Energy has been manufacturing high efficiency, high quality wood and gas fired appliances here in Canada for over 28 years. All Pacific Energy fireplace products are of the highest quality, and incorporate the latest technology and features including rich porcelain enamel finishes. All of this, is backed up with the best Lifetime Warranty in the business. Pacific Energy's exclusive “knife edge” door seal and quality construction. A “floating firebox” design eliminates metal fatigue from expansion and contraction. Pacific Energy was the first to introduce glass-front wood stoves and the air-wash system to keep glass clean. Pacific Energy developed the patented Extended Burn Technology and all models come with a Lifetime Warranty. This stove will be as beautiful as it is functional with a choice of optional, colorful porcelain finishes with gold or nickel accent trims. It's easy to operate with a single air control lever and an air wash system for the glass that really works." I thought this was an interistion read and brings the question up ...........How long has the glass door air wash systems been around ?