Window inserts - Chrome Cover F. scale. Application N/S Maximum Safe Operating Pressure (psi) N/S Maximum Safe Operating Pressure (kPa) N/S Mounting N/S Approvals Underwriters Laboratories Inc. N/S Approvals Canadian Standards Association N/S Approvals Factory Mutual N/S Connection Size (in.) N/S Differential Pressure Range (psi) N/S Differential Pressure Range (kPa) N/S Approvals NEMA Standard N/S Number of Pipes N/S Changeover Pressure (psi) N/S Changeover Pressure (kPa) N/S Mainline Pressure Range (psi) N/S Capacity N/S Control Range (fpm) N/S Control Range (m/s) N/S Number of Sensor Inputs N/S Remote Control Point Adjustment N/S Approximate Throttling Range Midscale (psi) N/S Approximate Throttling Range Midscale (kPa) N/S