I'm planning on purchasing a stove this weekend. It is a used Keystoker 70,000 BTU. Approximately 8 years old. It has the direct vent or power vent option. Thinking the difference means that a power vent pushes out the exhaust but still uses room air to feed the fire. And direct vent would use outside air on the fire. Is this right? I'm attaching pictures to see if anyone recognizes this model, or has any input or feedback about the model described above or shown in pictures. Any and all feedback would be helpful... ASAP.