Osburn Part Refractory Brick 4.5" x 9", 1600

The refractory bricks lining the firebox of the Osburn 1600 serve three key functions. They protect the steel firebox walls from direct flame contact and the intense radiant heat loads generated during high-output combustion, preventing the steel from overheating and deteriorating prematurely. The dense refractory material absorbs heat during combustion and radiates it back into the firebox, helping maintain the elevated firebox temperatures required for efficient and clean-burning operation. Properly maintained refractory brick lining is essential to the appliance's certified performance — the firebox must not be operated with cracked, broken, or missing bricks.

The correct refractory brick part number for each position in the Osburn 1600 firebox is specified in the parts diagram and brick installation instructions in the owner's manual for the specific 1600 model being serviced — whether the 1600 stove or 1600 insert. The Osburn 1600 firebox uses multiple brick sizes and part numbers at different positions, and the brick being replaced must be identified against the parts diagram to confirm the correct part number before ordering. Ordering based on measured dimensions alone without confirming the part number against the parts diagram may result in receiving a brick of incorrect thickness or configuration for the specific firebox position.

Refractory bricks should be replaced when they show visible cracking through the full depth of the brick, significant chipping, or have broken into pieces. Surface hairline cracks from normal thermal cycling are expected and do not necessarily require immediate replacement, but cracks that have propagated through the full depth of the brick or that are widening progressively with each heating season represent structural failure and the affected bricks must be replaced. Broken bricks that are no longer intact must be replaced immediately before the stove is operated further. The firebox brick lining should be inspected at the start of each heating season as part of routine annual maintenance.

The AC03020 is confirmed as a refractory brick for Osburn 1600 heating products, which includes both the 1600 freestanding wood stove and the 1600 wood fireplace insert. Both the 1600 stove and insert use the same high-density refractory brick lining and share common brick part numbers for the standard brick positions within their fireboxes. Compatibility of the AC03020 with the specific 1600 model being serviced should be confirmed against the parts diagram in the owner's manual for that specific model before installation.

All firebox brick service must be performed only when the appliance is fully cooled to ambient temperature. The firebox interior, refractory bricks, and all surrounding appliance components retain heat for an extended period after the appliance has been in operation due to the high thermal mass of the refractory lining and steel firebox structure, and contact with these components while retaining heat poses a severe burn hazard. All brick replacement must follow the brick installation instructions in the Osburn 1600 owner's manual to ensure bricks are correctly positioned and the complete firebox lining is properly reassembled before the appliance is returned to operation.

The Osburn 1600 firebox uses multiple refractory brick sizes and part numbers at different positions within the firebox, in addition to the 4-1/2-inch by 9-inch brick AC03020. The complete brick lining configuration including all brick part numbers, quantities, and positions is specified in the parts diagram in the Osburn 1600 owner's manual. All bricks required for a specific firebox position must be identified from the parts diagram and ordered by their correct part number to ensure the replacement bricks are the correct size and configuration for each position in the firebox lining.