I bought the Regency model I2450M fireplace insert. The first problem with this insert is that the damper is almost impossible to adjust. It takes all I have to make the damper adjust. My wife is not able to adjust it. The second problem is that the air tubes fall out at least once a week if not more. This design is pure garbage. Since the air tubes hold up the fire brick in the top of the unit this is a problem. Every time the tube falls out we have to let the fire die then cool down then replace the tube and restart the fire. Since we use this insert for heat this is not an acceptable solution. Designing the tubes do they actually lock into place would be a better design. I would have never purchased this insert if I had known what a pain it was too actually use it on a daily basis.