Same question here.. I have 2 x 1000W lights connected in line I was wondering if 1 - :S&P TD Series Inline Fan. Integrated Mounting Bracket Included. Usually ships within 1-2 Days. For 6 inch round duct - 293/218 cfm (high/low). 1 to 4: $127.00 - would be enoughfor both bulbs or should i buy two.