Fan Noise/air movement

[Gigemags05]

I have an 18x35x9 shop. I have a dedicated circuit that has four outlets for fans. They are 8' high. I am also running an 18000 BTU mini split.

My questions: How much CFM should each fan have for adequate circulation?

How loud is it going to be in there with 4 fans going? I want good air circulation but I don't want it to be so loud that I can't have a normal conversation.

I found some fans that move 2600 CFM and are 60 db. Thoughts?

 

[American Locomotive]

There are many factors besides cfm, including things like velocity of the air. Have you considered cieling fans?

 

[Gigemags05]

Ceiling fans aren't really a feasible option due to the ceiling height, wiring, and mounting options.

I wish I would've thought about ceiling fans in the planning stages of this, but I don't think they are an option anymore.

 

[ddawg16]

Use variable speed.....on low it should move plenty of air without too much noise.