According to IS 2190 guidelines for industrial/storage occupancies (warehouses), you require at least one 9kg ABC Dry Powder extinguisher for every 3,000 sq ft of floor area. Additionally, the maximum travel distance to reach an extinguisher should not exceed 15 meters (50 feet). For a 20,000 sq ft layout, you will require a minimum of 7 to 8 cylinders of 9kg ABC powder, distributed along corridors and exit doors.