Diffuser System Diffuser Type Grass-Like Fiber Diffuser Air Flow Rate (Maximum) 0.5 scfm Air Flow Rate (Minimum) 0 scfm Active Surface Area 32 sq ft Minimum Depth Required 18 in Bubble Type Fine Number of Air Tubing Rolls 1 Air Tubing Roll Length 20 ft Diffuser Height 12 in Diffuser Length 9 in Diffuser Width 9 in