Santa Claus is not the only one worrying about the insides of chimneys.
Ian Donnelly's worry, he said, is that at least 70 million chimneys in the United States and Canada need repair or alteration to prevent fires and carbon monoxide.
And a couple of Eastern natural gas utilities are doing their bit to call attention to educate customers about possible hazards connected with defective fireplaces.
Donnelly's concern is not entirely altruistic. He is president of Z-Flex Inc. of Manchester, N.H., which produces chimney liners that modify and upgrade flues.