This impromptu conversation held at The Energy Conservatory (TEC) describes zonal pressure diagnostics. The topic of discussion is implementation of ZPD being used as a diagnostic tool as well as a sales approach. Key valuable resources are listed here for anyone beginning or continuing their journey into ZPD.
ZPD Calculator from RedCalc
https://www.redcalc.com/zone-pressure...
ZPD full tutorial from TEC and Rick Karg from RedCalc
   • Zone Pressure Diagnostics with Rick Karg  
HVAC School - ZPD Backtalk Series articles by Genry Garcia of Comfort Dynamics, Inc
https://hvacrschool.com/zonal-pressur...
https://hvacrschool.com/zonal-pressur...
https://hvacrschool.com/zonal-pressur...