Osburn Part Firebrick 4"x8" X 1 1/4" HD

The Osburn High Density Refractory Brick, part number AC03030, is a pack of nine high-density refractory firebricks each measuring 4 inches by 8 inches by 1-1/4 inches for replacement of worn, cracked, or damaged firebox firebrick lining in Osburn wood stoves and inserts.

The high-density refractory construction of the AC03030 brick provides excellent thermal resistance, withstanding firebox temperatures up to 2,000°F or 1,100°C during sustained high-output wood combustion. Refractory firebrick lining is a required component of the firebox in wood stoves and inserts — it protects the steel firebox walls from the intense heat of the combustion chamber, absorbs and radiates heat back into the firebox to promote complete combustion, and maintains the firebox interior at the elevated temperatures required for efficient and clean-burning operation.

Firebricks in a wood stove or insert are subject to thermal cycling stress during every heating season and will deteriorate over time with normal use. Cracks in firebricks widen progressively with continued thermal cycling and a brick that has sustained significant cracking or has broken into pieces must be replaced before the stove is operated further, as damaged firebricks expose the steel firebox walls to direct flame contact and high radiant heat loads that the unprotected steel is not designed to withstand.

The firebox brick lining should be inspected at the start of each heating season and any cracked, chipped, or broken bricks identified during inspection should be replaced promptly. The 4-inch by 8-inch by 1-1/4-inch dimensions of the AC03030 brick are a common size used across a wide range of Osburn wood stoves and inserts and across many other wood stove brands — compatibility with the specific appliance being serviced must be confirmed against the owner's manual or parts diagram for that appliance before installation.

What's Included: Nine Osburn AC03030 high-density refractory bricks each measuring 4 inches by 8 inches by 1-1/4 inches.

Installation Limits: All firebox brick service must be performed only when the stove is fully cooled. Compatibility with the specific appliance being serviced must be confirmed against the owner's manual or parts diagram before installation. The stove must not be operated with cracked or damaged firebricks, or with missing bricks, before replacement is completed.

Compatibility: Fits most Osburn wood stoves and inserts using the 4-inch by 8-inch by 1-1/4-inch firebox brick size. Confirm the correct brick part number against the owner's manual or parts diagram for the specific appliance being serviced.

• Pack of nine high-density refractory firebricks each measuring 4 inches by 8 inches by 1-1/4 inches for replacement of worn or damaged firebox brick lining in Osburn wood stoves and inserts
• High-density refractory construction withstands firebox temperatures up to 2,000°F / 1,100°C during sustained wood combustion
• Firebrick lining protects the steel firebox walls from direct flame and high radiant heat loads and maintains the elevated firebox temperatures required for efficient and clean-burning operation
• The firebox brick lining should be inspected at the start of each heating season — cracked, chipped, or broken bricks must be replaced before the stove is returned to operation
• The 4-inch by 8-inch by 1-1/4-inch dimension is a common size across a wide range of Osburn wood stoves, inserts, and many other wood stove brands
• Compatibility with the specific appliance being serviced must be confirmed against the owner's manual or parts diagram before installation — all firebox brick service must be performed only when the stove is fully cooled

The Osburn AC03030 High Density Refractory Brick is a pack of nine OEM SBI high-density firebricks each measuring 4 inches by 8 inches by 1-1/4 inches and rated to 2,000°F, providing replacement firebox brick lining for Osburn wood stoves and inserts requiring the 4-inch by 8-inch by 1-1/4-inch brick size.