United States Stove Company 7700 Manual page 24

Forced-air
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MASONRY CHIMNEY
Ensure that a masonry chimney meets the minimum standards of the National Fire Protection Association (NFPA) by having it inspected
by a professional. Make sure there are no cracks, loose mortar or other signs of deterioration and blockage. Have the chimney cleaned
before the furnace is installed and operated. When connecting the furnace through a combustible wall to a masonry chimney, special
methods are needed as explained in the "Combustible Wall Chimney Connector Pass-Throughs" Section.
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