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The HART COOLEY 3eal is a 3-inch round, double-wall Type B gas vent 90-degree elbow used to change direction in venting systems for gas-fired appliances. The double-wall construction provides an insulating air space between the inner and outer walls, maintaining flue gas temperature and reducing the risk of condensation in the vent connector. Weighing 0.78 pounds, this lightweight fitting is a standard component for residential gas venting installations. Licensed HVAC technicians and plumbers install this fitting as part of a complete Type B vent assembly serving natural gas or propane appliances.
This elbow is suited for use in residential venting systems connected to gas furnaces, water heaters, boilers, and other Category I gas appliances that require Type B double-wall vent connector fittings. The round profile and standard flat geometry make it compatible with straight Type B vent sections of the same diameter. It is intended for interior, concealed, or exposed venting runs where a 90-degree direction change is required before connecting to a vertical flue or chimney.
Designed as an OEM-style replacement or new-installation fitting for 3-inch Type B double-wall round gas vent systems on residential Category I gas appliances.
Installation of Type B gas vent fittings must be performed by a qualified HVAC technician or plumber in accordance with NFPA 54 and local mechanical codes. Shut off the gas supply and allow the appliance to cool completely before servicing or modifying any vent connector. Follow the vent manufacturer assembly instructions for proper joint overlap and locking orientation. Type B vent must not be used with appliances that require direct-vent, single-wall metal, or other vent categories.
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