In many applications of perforated plate,
the estimated energy loss or pressure loss through perforated plates is one of the design considerations. The following pressure loss information was developed from a laboratory air flow system at Penn State University. The laboratory system maintained a non-swirling flow impacting perpendicularly on the sample. Various perforated thin gauge plates were inserted into a uniform velocity air flow stream.

Pressure loss for ambient air flow was then measured at a series of velocities and reported as inches of water column loss for each flow. This data, therefore, presents the best flow condition value of loss. Pressure loss can be estimated beyond the range of the data on the basis of the ratio of the anticipated velocity to the highest tabulated velocity. This ratio squared multiplied by the tabulated pressure loss can be used to approximate the higher velocity loss.

Data was developed with the 0° being perpendicular to the flow and at angles of 22.5° and 45° away from perpendicular. Test plates #5 and #7 are presented to show effect having different thicknesses on air flow.