Several customers want to do VFD on big-ass dust collector fans. I need a measuring device that can be inserted into a duct intake or test port and measure CFM.
These ducts are at least 60" round and the systems have airflow at the fan of 150,000 cfm. We need to verify what slowing those fans down does to the CFM on all the ductwork branches.
Is there an electronic instrument out there today capable of doing that? I can do it other ways, like using duct pressure and trying to extrapolate the data, but I'd really like to verify it with a REAL CFM reading.
Any suggestions?
Jake