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I'm reaching out to inquire about availability and pricing for a high-volume, low-speed fan suitable for large spaces. I'm specifically interested in a model that has an approximate diameter of 4.5 feet or 1.30 meters. Additionally, could you provide details on the energy efficiency, airflow capacity, and any warranty options available? It would be great to know about customization options as well, if possible. Please let me know the lead time for orders and any bulk purchase discounts that might apply. Looking forward to your prompt response!