What a great opportunity for you! I'm happy to answer your question.
As I researched your question, I learned that it's valuable to have an organization assist you in marketing your product. It would be easy to say "just write to Duraflame" but that may not produce the results you are hoping for.
Here are a few links to help get you started:
United States Patent and Trademark Office
In their FAQs section, they indicate the ways to develop and market your product. This may be too generic for you but if you haven't checked out their website, this will be a valuable resource for you.
"Let the nation's preeminent Inventor Assistance company help you protect and confidentially present your invention to manufacturers, marketing companies and the media worldwide!" is stated on their home page. This could be the assistance you need to help you follow the right steps to successfully marketing your product. I checked the Better Business Bureau and they do not have any reports on this company. See link: www.fortworth.bbb.org/commonreport.html?compid=A2020402.
Joining an inventors association would be valuable. This would offer many resources, including input from fellow inventors. I located the United Inventors Association at www..uiausa.org/. There is an Innovation Assessment Program, free email newsletter, and an Ask the Experts forum, among the many services listed. I tried to get the membership fee but the membership page wasn't available at that time (perhaps updating the site).
I hope this answers your question. I wish you much success and hope that you do well with this, and future, inventions.
Best of luck,