Pedicure Exhaust

[fayazdin1]

Hello All,
I am designing a salon which has 10 pedicure stations. I got submittals for pedicure chair. This chair has two 1-1/8" pvc exhaust pipes. Code requires 50-cfm exhaust per station. When I calculate external static pressure (E.S.P) drop to size the fan, sucking 25-cfm from 1" pipe has a pressure drop of 58.8 inwc/100ft. So, lets say I have 4-ft pipe inside the chair will give me a pressure drop of 2.35 inWC only in the chair.

This is not realistic to me, may be I am making mistake?
If you have experience in Nail and foot salons, please share with me especially with pedicure seats
Thanks
Fayaz

 

[lukaiENG]

Does all the air need to be exhausted from the chair itself? can you not exhaust say 40 CFM from above the chair and 10 CFM from the chair exhaust?