I've got a Jotul Oslo... which has a grate in the bottom...obviously which allows 2 things to happen. One to let the ashes fall thru and out & 2... so air...I'm assuming to allow the fuel to burn better. So why is it I hear so many people say it's better to leave an inch or so of ashes to accumulate in the bottom of our stoves? I know some of you will say that there has been many discussions on the subject. I'm lazy...and don't want to search for this and maybe get some new thoughts on this. haha Thanx in advance!