Currently running a Quadrafire 2700i insert. I seem to be having trouble getting consistent airflow into the insert. I will start a fire, let it get going with the door open. However as soon as I close it the fire visibly dissipates. I end up burning through a load of wood before I can establish a hot enough bed of coals to sustain a fire. I'm thinking of getting an outside air kit. Does anyone have a similar situation that an outside air kit fixed?