Name:  20120914_110236.jpg
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Size:  48.8 KBRan into this several times. Furnaces that use this method may have small little leaks in the exchangers. This 8 year old furnace has 32 leaks, notice the little straw I placed into the hole. Man didn't want it fixed but wanted it OUT of his home! Smart move. Major brand that's relabeled and sold to lumber yard for DIY.