Check the listing for details. Catalytic Combustor Replacement model # 3406 for some Heatilator (Arrow). Condition: New. Listed at 165.00 USD. 5.66'' round x 2'' 25 cells per square inch replacement catalytic combustorItem specificsCondition:New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ... Read moreModel:3406Material:CeramicItem Depth:5.66"roundType:CombustorItem Height:2Brand:UnbrandedItem Width:Our catalytic combustors consist of a durable, temperature-resistant ceramic composition that is extruded into a specific cell density, creating a honeycomb configuration. It is then cut to specified sizes and fired. The unit is then wash coated with alumina oxide for high surface area coating and precious metal support. Later a noble-metal catalyst, like Palladium, is applied. 90% Less Pollution. 90% Less Creosote. 5.66" round x 2" 25 cells per square inch replacement catalytic combustor