I have a forced hot air system. All of my heating vents (except one) make a steady hissing sound during a warming cycle. However, one of them makes a sputtering noise. Is this anything to be concerned with? Perhaps, I need to have an escape valve replaced? They all seem to work fine warming the house. I don’t want to call a repair service for no good reason.
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check all the dampers and make sure the wing nuts are tight, most codes say the dampers must be located within 2 feet of the main duct
first pull the register and see if that helps, if not it may be a ductwork issue, like maybe the air is bypassing that run sometimes. other than that with the description, i dont know.
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