Run with or without the air duct on a K40?

Lasers
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1

Run with or without the air duct on a K40?

2

Middle of warehouse… kinda hard to vent outside

3

Depends what Im doing. plastic/wood I vent. Granite I do not

4

I was on about taking out the duct on the inside of the machine. Still gonna vent the system as you be liable to be in hospital after breathing the crap in!!