I have a supreme ambiance elegance 40 wood fireplace. It has the normal blower attached to the unit, but also has knockouts to add additional vents to heat up to 25’ away. Of course they want you to buy the “supreme” vent kit and blower for $500, but after doing some searching, it’s just a 150cfm in-line fan with a flange kit to mount to firebox and some insulated duct. It also says you must use their fan or it could void warranty if stove over fires. Question is how could that possibly happen. Has anyone made their own setup. I bought a variable speed fan and duct for $58 on Amazon.