If I convert my wood-burning fireplace natural gas, will I need to get glass doors put on? One dealer told me I need to because when I'm not using the fireplace, the pilot light will still be on and I need to keep the vent open all the time. Is this right? I couldn't find any information like this one the web. I think she was just trying to get me to buy some doors. I saw some doors at Lowes and Home Depot for around $300, but the ones she was pushing on me were $400-$600 and there was an additional $150 installation charge. Is it really that hard to put the doors on?