DIY silencer for a fan/blower to reduce noise

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.


This blower will be installed indoors in a laboratory to test heat exchangers, not for growing . I noticed that a lot of people on this forum are experienced with silencers so I thought this would be a good place to ask for some help.


I need to reduce the noise level from 92 dB to around 60-70 dB (I believe this is a good level where conversations can be heard, if it's not possible please let me know what's possible). I am looking to make or buy two silencers that will fit with the 7.125" x 5.75" outlet and the 8" diameter inlet. I was wondering if anyone knows whether DIY silencers could work for this blower. I have asked several companies and have been told both silencers will cost around $1000 but from online research I learned about cheap DIY silencers.


The blower will run at flow rates between 165 cfm to 1600 cfm. Also, I want to make sure the connection between the fan and the silencer is tightly sealed so no air leaks out.


Cheers

I'm sure there is a DIY way. But check any hydro store site and you can likely find a muffler that will fit. $1000 is insanity. Mufflers are like 50...

http://www.htgsupply.com/Category%2DDuct%2DMufflers%2Easp

Mufflers are nothing like that. Why doesnt anyone make a nice long free flowing muffler.

You can wrap it in ducting insulation and suspend it from a horizontal surface via bungee cords to eliminate any noise generated from vibration. When wrapping, do not wrap the motor to much due to overheating issues. This will lead to premature motor failure due to heat build up.

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?