To give you a feel for power, CFM and vacuum pressure for various air pumps I'll offer this overview. ..
The power output of a blower equals the vacuum it draws in inches of water column x the CFM output divided by 8.5. For reference, 1 psi = 27.7 inches of water column pressure.
Shop vacs are noisy because they are designed to produce 2 - 4 psi of vacuum which requires around 30,000 rpm at the impeller which is around 4" in diameter. They need to offer higher pressure so the flow rate doesnt drop too much when the filter starts getting dirty. More rpm usually means more noise. The big ones draw around 1500 watts and provide around 130 to 180 cfm with a clean filter and no restrictions other than the hose. If you block the hose most will produce around 2 psi of vacuum.
A 1.5 hp dust collector also uses about 1500 watts but it will have a large 11" impeller turning at around 3400 rpm. Dust collectors produce a max of 0.5 psi or less when the inlet is blocked and around 800 cfm free flow (for a 1.5 hp one). Since the impeller is turning 1/10 th the rpm a dust collector is much quieter. They use huge bag or cartridge filters so they don't need much pressure to move a lot of air through the filter.
There are all kinds of fan designs in between those two. A furnace blower operates at around 1200 cfm and 0.2 inches of water vacuum (0.2/27.7 psi) with just around 500 watts. They don't flow much at all through a restriction though.
That should give you a basic feel. Feel free to ask if you have more questions.