Long runs of flex vs hard pipe, the hard pipe has less restriction to air flow = more flow for less fan HP. Equals less power consumed. Kev if what you run works for you that's all you need. You certainly are very good at the laser business and so knowledgeable.
I worked with engineers and they wanted it done so when the customer turned the system on it did move the specified amount of air at the lowest energy cost.
My own system. Inline fan, short 3 ft intake to fan, 6 feet to outside exhaust vent and yes its flex.
Last edited by Bill George; 09-14-2020 at 9:38 AM.
Retired Guy- Central Iowa.HVAC/R , Cloudray Galvo Fiber , -Windows 10
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