Osburn Part Insulated Pipe, All Models

The AC02090 is the flexible pipe section that bridges the distance between the stove-side fresh air intake adapter or kit connection point and the exterior wall penetration where outside air enters the building. It carries cold outside combustion air from the exterior wall opening through the building structure to the heating appliance's combustion air intake. The 4-foot length provides sufficient reach to bridge the wall thickness and any short routing distance within the wall cavity or floor structure at the installation location. Its flexible construction allows it to be bent and routed around obstructions that a rigid pipe section could not accommodate.

The fiberglass insulation layer on the AC02090 pipe is necessary to prevent condensation from forming on the exterior surface of the pipe as cold outside air passes through it into the warmer installation space. When cold air travels through an uninsulated pipe routed through a warm indoor environment, the cold pipe surface causes moisture in the room air to condense on the outside of the pipe, similar to condensation forming on a cold glass. Over time this moisture can cause water damage to surrounding building materials or create a moisture problem at the floor or wall penetration where the pipe exits. The insulation keeps the pipe exterior closer to room temperature and eliminates this condensation risk.

The AC02090 5-inch insulated flex pipe is compatible with Osburn fresh air intake kits and adapters that use a 5-inch pipe diameter, including the AC02080 fresh air adapter, the AC01331 5-inch fresh air intake kit, and the OA10500 fresh air intake kit for wood stoves on a pedestal. It is also the recommended companion flex pipe for completing the AC01421 fresh air intake kit installation on the Osburn 950 wood stove on legs. The AC02090 provides the flexible pipe connection between these stove-side components and the exterior wall termination of the fresh air intake system.

Yes. The AC02090 is designed for use with any Osburn wood stove or insert model that uses a 5-inch fresh air intake system, and is listed by the manufacturer as compatible with all Osburn models using a 5-inch intake. This broad compatibility reflects the fact that the AC02090 is the flexible pipe section of the fresh air intake system — its function does not vary by stove model, and any Osburn stove or insert with a 5-inch fresh air intake connection can use this pipe regardless of the specific model variant.

The AC02090 provides a 4-foot length of insulated flex pipe, which is sufficient for most installations where the stove is positioned in reasonable proximity to an exterior wall. If the installation requires a longer run of flex pipe to reach the exterior wall penetration, additional pipe length may need to be sourced — the total fresh air intake pipe length and routing must comply with the requirements specified in the owner's manual for the specific appliance and the applicable local building codes governing combustion air supply installations. An authorized Osburn dealer or qualified installer can advise on the correct pipe length and routing approach for a specific installation configuration.

All fresh air intake installation using the AC02090 must comply with local building codes and all applicable standards governing combustion air supply for wood stove and insert installations in the jurisdiction where the appliance is installed. All installation must follow the fresh air intake installation instructions in the owner's manual for the specific heating appliance being served. 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. Installation by a qualified installer is recommended to ensure the complete fresh air intake system is correctly routed, connected, and sealed in compliance with all applicable requirements.