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Boiler flue gas economizer application and required process result; Exhaust and recovery programme: Provide fuel, flue-gas flow and temperature over the load range, water inlet and target outlet conditions and available heat demand. Identify condensation and acid-dew-point constraints.; Condensing and materials choice: Compare heat-transfer surfaces, corrosion resistance, bypass, drainage and cleaning arrangements. Check boiler backpressure and how recovered heat integrates with the existing plant.; Representative input variation and difficult production cases; Required acceptance evidence: Verify the agreed heat balance and exhaust pressure loss at documented boiler loads. Record inlet conditions, condensate handling where applicable and protective bypass or low-flow responses.; Site and utility scope: Prepare duct supports, access, compatible water connections, drains and controls coordinated with the boiler and chimney designer.; Service provision: Inspect deposits, corrosion, seals and drains, and maintain sensors and cleaning access. Review recovery trends against changes in boiler load or fuel.; OEM/ODM engineering scope: OEM duct and control interfaces may be configured; ODM fuels or condensing conditions require corrosion and thermal validation.; Upstream preparation and downstream handling interfaces; Destination country and applicable installation requirements; Production schedule, changeover mix and operator availability; Drawings, samples, inspection method and rejected-output criteria.