We have a 36" Fireplace Xtrordinaire (has a catalytic converter). We also have a nearly 3 stories high chimney which I have been unable to find a sweep willing to climb. I have had a couple of sweeps tell me this fireplace can be cleaned from inside the house, but I fear they told me this because they didn't want to break out the tall ladders and brave the height of our chimney. I was hoping someone with more knowledge could either confirm my fears, that the highest portion of our chimney is likely not being adequately cleaned, or put my worries to rest by confirming this type of fireplace need only be cleaned from the inside. Any thoughts shared, greatly appreciated.