I'm a newbie. I was talking to my installer today who has a freestanding unit. I have a Harman Accentra Insert. He recently had an indicent where there was a power failure in his home when the stove was in operation. The fans obviously shut down and the unit doesn't feed pellets at that point. He did NOT have a battery back up system. The smoke from the smoldering pellets that continued to burn in the burn pot escaped the stove from every little space and filled his house with smoke. Is this normal? He also did not have a direct fresh air vent. Would of that helped in the escaping of the smoke? After listening to this story I am a little skeptical about leaving the stove unattended when not home and worrying about a power failure. Not to mention there are pets that could be effected by the smoke if this was to happen in my home. Is the answer to this problem to invest in a battery back-up system? Any help would be greatly appreciated.