Direct answer
Provide the device function, opening and available area, target ingress protection, acoustic or airflow target, environment, housing material, assembly method and project stage.
Minimum engineering brief
Share a drawing or dimensions for the opening and bonding surface; enclosure volume for pressure vents; sound path and transducer details for acoustic membranes; target IP test; temperature, humidity, chemicals and contamination; expected quantities; and whether assembly is manual or automated.
Why project stage matters
Early concepts allow material and geometry to be optimized together. Later projects may require a drop-in size, existing tooling and qualified processes. Stating timing, sample quantity and validation status helps make the recommendation practical.