Osburn, Fresh Air Intake Kit 4" x 5', Everest II Wood

The fresh air intake kit provides a dedicated pathway for outside combustion air to reach the fireplace directly from the exterior of the building, rather than drawing combustion air from the room air inside the installation space. This provides better combustion air balance for the house — particularly in tightly constructed homes where natural air infiltration through the building envelope is limited. It is required when the fireplace is installed in a mobile or manufactured home, and is required in some jurisdictions by local building code. Even when not required, a fresh air intake provides the advantage of improved combustion air availability that supports consistent draft performance.

The Osburn Everest II and Stratford II wood fireplaces use a 4-inch diameter fresh air intake system, while Osburn freestanding wood stoves typically use a 5-inch diameter system. The intake diameter is determined by the combustion air requirements of the specific appliance and the geometry of the appliance's combustion air intake collar — it is a design specification of the individual appliance. The correct fresh air intake kit and pipe diameter must always be confirmed against the owner's manual for the specific appliance being served before ordering, as using an incorrectly sized kit or pipe will result in improper fit and connection.

To complete the full fresh air intake installation for the Everest II or Stratford II, HVAC flexible pipe and air intake grille screws — sold separately — are required in addition to the AC01239 kit components. The AC01347 4-inch fresh air intake register with airtight damper is the recommended companion wall termination component that provides a controllable and airtight closure at the interior wall surface, allowing the fresh air intake opening to be closed when the fireplace is not in operation to prevent cold air backflow. The 4-inch insulated flexible pipe for the Stratford and Everest II fresh air intake systems is also available as a separate accessory to provide the pipe run from the fireplace-side adapter to the exterior wall penetration.

A fresh air intake is not mandatory for the Osburn Everest II in all installations. It is required when the fireplace is installed in a mobile or manufactured home, and it is required in any installation where local building codes or the manufacturer's installation instructions specifically require it. In conventional residential installations with adequate natural air infiltration, the fresh air intake is an optional accessory rather than a requirement. However, even when not mandatory, the Osburn Everest II manufacturer notes that a fresh air intake always provides the advantage of better balancing the house with respect to combustion air, and can help improve draft performance and reduce negative pressure issues.

All fresh air intake installation must comply with local building codes and all applicable standards governing combustion air supply for wood fireplace installations in the jurisdiction where the appliance is installed. All installation must follow the fresh air intake installation instructions in the Osburn Everest II or Stratford II owner's manual. Installation by a qualified installer is recommended to ensure the system is correctly routed, connected, and sealed in compliance with all applicable requirements. The exterior wall penetration for the fresh air intake pipe must be correctly sealed around the pipe to prevent air and moisture infiltration through the wall structure.

The Osburn Everest II is an EPA-certified zero-clearance wood fireplace featuring a large firebox and double cast iron doors, with a recommended heating area and performance specifications detailed in the Everest II owner's manual and the Osburn manufacturer product page. It uses a 4-inch diameter fresh air intake system for installations requiring a dedicated outside combustion air supply. Optional accessories include the AC01239 fresh air intake kit, the AC01347 4-inch fresh air intake register with airtight damper, and 4-inch insulated flex pipe for fresh air intake. A traditional and modern style faceplate are available as required finishing components for the Everest II installation.