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William Chops Westfield wrote:

>> <>The usual failure mode involves fumes and (rather violent) fire,
>> rather than explosion and shrapnel. I would worry that your
>> plexiglas would make a fine fuel for expanding the fire...
>>

A gentleman I knew had several lasers for cutting intricate designs in 
paper and wood.
On rare occasions they would have a fire in the cabinet. I made a 
circuit for him that when the operator would hit a panic button it would 
turn off the laser, flood the cabinet with CO2 and slow the exhaust fan 
down quite a bit.  He had CO2 on hand for some of the lasers.  the 
exhaust fan was slowed down so it did not suck the CO2 out faster the we 
put it in and yet exhausted the fumes from the cabinet.  
 You could add a system like this to your Plexiglas box quite 
reasonably. Get your self a CO2 bottle for about $20 to $50 dollars. a 
valve to fit bottle for about $10 a regulator for $30 to $40(this will 
drop the CO2 bottle from 900 + PSI to under  100 PSI.  You can have the 
CO2 bottle filled at the local Paintball store for About $2 to $6 
depending on size and location. 

You watch ebay you can buy the stuff  at  quite a savings. 

I have some of the used stuff on hand now if you wish to contact me off 
list.



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