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Start with the drawing and the features that must be retained. Feasibility and the final specification need review.

• Drawing revision, overall dimensions and critical tolerances.
• Material, connections, sealing and known operating conditions.

Share the existing part reference and installation details. Matching appearance or dimensions alone does not establish equivalent performance.

• Part reference, dimensioned drawing or photographs of the element and interfaces.
• Current application, required filtration result and reason for replacement.

Describe the process and the result you need. A product family can remain undecided while the requirements are reviewed.

• Fluid or gas, contaminants and separation target.
• Known flow, temperature, pressure drop and equipment constraints, with units.

Describe what the sample needs to demonstrate. Sample availability, configuration and evaluation conditions need confirmation.

• Proposed element or drawing and the evaluation quantity.
• Test conditions, acceptance criteria and required records.