Ive been burning wood in a fireplace insert for two years and am about to clean the chimney for the first time. I check it on a regular basis and only have a small amount of creosote on the flues(the flues are 10in square)I pulled out the insert and vac-ed everything and took the fan(blower) out of the insert to be checked and oiled by a local electric motor repair guy.any hints on how to keep the dust and ash to a minimum in the house ....cover the fireplace opening etc when running a brush up,down and around?