Drop the decibels of a generator by 10db in 10 seconds without welding, building or virtually any out of pocket cost. I take a screaming loud generator and drop it an amazing amount, from 80db(a) to 70db(a) at 23 feet(industry standard testing) in seconds. This is only a proof of concept using a scientific approach.

I use a real decibel meter(not a phone) to show before and after real world results. http://www.amazon.com/gp/product/B00E...

Watch me show the difference with and without a auto muffler:    • Quiet a generator with an automotive ...  

Absorption Muffler Video By BCTRUCK:    • How to make your generator quiet,powe...  

I've run temp checks and everything stays within a few degrees. The trick is to leave plenty of area for proper air flow. Any engine will only pull in so many cfm of air while cooling and it doesn't require 360 degree air flow. A standard air cooled engine pulls all of it's cooling air through a few square inches behind the pull start. The spacing left at each corner is probably 100x the required area for proper cfm in and out. Air cooled engines are run successfully in fully and partially enclosed areas all the time; ie Honda's full line of inverter generators are fully enclosed with only a small opening at the front and rear for air flow, Along with pretty much every RV generator, riding lawn mowers only leave partial openings for airflow to reduce noise and the list goes on.