Blower RPM Required for Proper CFM Formula
Blower RPM Required to get the right CFM: (CFM 1)/(CFM 2) = (RPM 1)/(RPM 2)
For Example:
Variables:
CFM 1 = 3000 CFM Currently
RPM 1 = 875 RPM
CFM 2 = We Want 4000 CFM
RPM 2 = Pulley Size Required to get the new CFM?
Step 1: (3000 CFM1)/(4000 CFM2) = (875 RPM1)/RPM2
Step 2: 3000 CFM1 x RPM2 = 4000 CFM2 x 875 RPM1
Step 3: (3000 CFM1 x RPM2 )/(3000 CFM1) = (4000 CFM2 x 875 RPM1)/(3000 CFM1)
Step 4: RPM2 = 3,500,000/(3000 CFM1)
Step 5: RPM2=1167