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  1. HVAC
    I think I know the answer, but want to double check. In the attached image, what is the flexible joint in the duct work? What's the purpose? This system has it on the return side. Is the supply supposed to have one too?
  2. HVAC
    Hello, I'm planning to buy a wood burning fireplace insert and I've visited several vendors in my area. The topic of chimney liner type was raised by one of the salesman I talked to. He was adamant that his company only installed flexible liners as a last resort (i.e. if the chimney design...
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