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Establish which part the estimate refers to
A catalytic or hybrid stove has different internal components from a non-catalytic appliance. Ask the provider to name the appliance model, the combustor and its location on the parts drawing. A large flat baffle, an air tube and a catalytic honeycomb are not interchangeable. If the original note belongs to a different stove or the model has no catalyst, set that recommendation aside until it can be reconciled.
Separate a blocked face from a missing section
EPA discusses buildup and physical deterioration as separate maintenance concerns. Ask whether the provider observed surface deposits, crumbling material, gaps around the assembly or a performance concern without visible damage. Ask whether the bypass or its seal could be involved. A face that looks dusty in a photo, a single smoky fire or the age of a house alone does not tell you the component has reached the end of its service life.
Follow the actual model maintenance instructions
Consult the manufacturer for which parts are accessible and whether a particular cleaning method is permitted. Do not scrape a coated honeycomb, blow it clear using shop air, bypass it permanently, or run the stove with it removed as a test. When the provider recommends replacement, ask which observation drove the choice, which model-specific part is specified and how the installed assembly will be checked before normal use resumes.