Question for NIAGARA FANS AND BLOWERS

I am Virgilio Emnace of Emnaces Grill located in Congressional Ave in Quezon city. I have one small centrifugal exhaust fan installed as my exhaust system. I like to inquire from yuor company if I can order from you bigger exhaust fan . The fan that I will like to order is for use in one griller size 2feetx4feet and one four burner stove . This two cooker will serve by one hood. Can you recommend the exhust fan needed for the two cooker?