Our exhaust system has no ducts, roof mounted fans are installed without any ducts, but the client is requesting for static pressure value, we need to prove them that in non ducted system we dont need to calculate external static pressure, need reference document from any standards for exhaust...
I know that for a non-ducted exhaust system, usually the SP ranges between .05" to .20"
Do we have any standard showing the above values to prove to our client, someone please share the reference
