Thanks everyone, I am also worried that after buying the silencers I'll realize that the bulk of the noise comes from the motor itself or the mechanical components of the fan... Not from the inlet and outlets. What do you guys think?
I bought the following blower from mcmaster:
In case you need extra information on the blower, here is the link for the blower:
http://www.mcmaster.com/#catalog/119/664/=n2aoy8
Specifically I bought "Heavy Duty Blowers" model 1953K55. There are blower performance curves that you can click...