BRR - Balanced Ratio Regulators are designed to provide accurate air/fuel ratio control of cross-connected combustion systems. The delivery pressure of the BRR will match that of the cross-connected signal being applied to the upper diaphragm chamber, as long as the minimum differential is maintained. A turndown ratio of 20 to 1 is possible with the BRR. The Balanced Ratio Series features large main diaphragms, a balancing diaphragm and soft rubber seat to insure good control at low turndown ratios. CAPACITY TABLE Model Number Pipe Size SCFH Gas Flow @ 4.0" W.C. Pressure Drop Inlet Outlet MFD. 0.4 Sp. Gr. NAT. 0.6 Sp. Gr. AIR 1.0 Sp. Gr. L.P. 1.5 Sp. Gr. 6 BRR 3/4" 3/4" 790 650 500 410 8 BRR 1" 1" 1,580 1,290 1,000 820 12 BRR 1-1/2" 1-1/2" 3,160 2,580 2,000 1,640 16 BRR 2" 2" 5,530 4,520 3,500 2,860 20 BRR 2-1/2" 2-1/2" 7,900 6,450 5,000 4,100 24 BRR 3" 3" 12,600 10,300 8,000 6,500 32 BRR 4" 4" 22,100 18,100 14,000 11,400