If your chimney cap has a metal mesh around it, pay extra attention to its condition, as they can clog up with creosote in a hurry. This i found out the hard way, when over a period of two days my woodstove started to lose its draw, then proceed to leak smoke all into the house, basically driving me out one night! I'd have never suspected this piece would clog so fast, due to several factors, among them being I've only been burning well seasoned hardwood, and make sure to build at least one really hot fire per day..., AND the fact that the stove has only been in operation 2 months! So if you're noticing a reduced draw in your woodstove, its a definite sign somethings not right... I believe i will replace the 'factory' mesh with chicken wire, this should keep things from gunking up so fast.