Quick question about when to close the bypass on stove. I have a Federal Airtight that came with the house I bought last year. I used the stove all of last year with no problems at all. My question is from what I read online that I should wait till the temp of the Cat reaches 500 degrees before closing the bypass in order for the Cat to burn properly. However, the instruction booklet ( which I just found) says to light fire and once "the fire is going" to close the bypass and then states the CAT will begin to work as intended once it reaches 500 degrees. Which way is correct? Or are they both correct? Thank you.