Kenmore Floor Care identifies retail SKU 53295 as an EF-1 HEPA exhaust filter and lists specific canister models, including 21514. The same page mentions a component code, KC38KCEN1000, which can be easy to confuse with the retail SKU.
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How to avoid a wrong part
Match the full canister code and confirm that you need the EF-1 exhaust filter. A dust bag, motor-protection filter, and exhaust filter are different purchase decisions. When a listing shows two numbers, check whether one is the package SKU and the other an included component.