Chris from CA.
Has anyone heard of a Zombie Box to quiet down a generator? Any Pro's or con's?

Thank you.
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78buckshot
I googled it to see what you were referring to. Nice idea. The generator NEEDS all the airflow it can get and to produce the advertised KW the engine also needs to be able produce the horsepower to drive the alternator. If you modify the factory generator with added exhaust muffler/piping, etc. it may not meet specs. At the very least I would contact Generac and get the answer from them, I would guess that it will void the warranty.
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Brian Baughman
The use of these generator coffins will void the listing of the generator and will void all manufacturer and extended warranties.  The better solution to reduce the generator sound levels is to use acoustical sound panels that are properly placed around the generator.  Many of the available sound panels can be finished with fence pickets to make them look better.  
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Birken Vogt
Instead of getting a cheap air cooled generator and then doing all kinds of money and work to quiet it down, buy a liquid cooled generator which is already super quiet, and enjoy the benefits of having a 4 cylinder 1800 RPM engine with a radiator and 5+ quarts of oil in it also.
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Geoff Z
We have a request into Generac for clarification. buckshot is correct about voiding warranty unless Generac endorses it. I will report back if we get an answer.
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patmurphey
Note: Generac's 4 cylinder 22kw liquid cooled is (run)rated at 70db. 22kw air cooled is rated at 67db.
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grsthegreat
Db ratings mean nothing to me in reality. I do know after installing both air cooled and liquid cooled 22s, the liquid cooled is alot quieter during operation.
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Cobranut
The loudest thing on my 30Kw diesel is the cooling fan.
The exhaust is almost inaudible and the turbo can only be heard when the load is significant.
The best solution is to put it away from the house.  Mine is about 80' away, and unless a door is open I can't hear it in the house at all.
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Geoff Z
patmurphey wrote:
Note: Generac's 4 cylinder 22kw liquid cooled is (run)rated at 70db. 22kw air cooled is rated at 67db.


The db ratings are deceiving. You can stand next to a liquid cooled and carry on a conversation. It is more of a hum type sound. For what they are the air cooled are not terribly loud. The insulation package does a nice job. However they are considerably louder than a liquid cooled.
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Geoff Z
The use of these generator coffins will void the listing of the generator and will void all manufacturer and extended warranties.  The better solution to reduce the generator sound levels is to use acoustical sound panels that are properly placed around the generator.  Many of the available sound panels can be finished with fence pickets to make them look better.  


Would it void the warranty on a portable as well?
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Brian Baughman
It technically would, but it would be hard to prove unless there were pictures.
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grsthegreat
Its amazing what heat buildup can do to sn air cooled unit....i replaced a controller in one persons unit because it warped out from heat. All keys were gone, screen even warped and discolored. They installed air cooled unit in shed even though they had ventilation and electric fan. Still over heated, they ended up removing walls on the shed.
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Birken Vogt
We have seen our share of warped plastic as well from improperly vented units.  We move them outside.
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Cobranut

There's a considerable amount of design and testing that goes into a proper enclosure.  I can see these boxes causing severe cooling issues.

All the manufacturer has to do to detect overheating is to put a dab of temp monitoring paint, like we use on brake discs on race cars, to see if it exceeds a certain temp.  If the paint has changed color, no warranty.

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JayH
That thing looks like it would wind up turning your generator into a very nice oven.
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