Give every supplier the same design brief: site conditions, incoming material, room loading, crop stages, operating hours and available utilities. Request itemised scope and exclusions. An equipment list alone does not establish that the loaded room will maintain the required environment or distribute air evenly.
Define commissioning and handover before purchase. Agree what is measured, where it is measured, under what load and outdoor conditions, and who witnesses the test. Record operator training, alarm response, documentation, spare parts and service responsibilities. Electrical, structural, refrigeration, steam and fire-safety design require qualified professionals and applicable local approvals.