Where:
Se = is the equivalent standard for the total exhaust stream.
Sa = is the actual standard for each exhaust stream ducted to the control device.
N = is the total number of exhaust streams ducted to the control device.
Qsda = is the dry standard volumetric flow rate of the effluent gas stream from each facility ducted to the control device.
QsdT = is the total dry standard volumetric flow rate of all effluent gas streams ducted to the control device.
40 C.F.R. §60.372