Why is my test chamber vibrating and/or making noises?

Check these possible causes and solutions:

The unit's fan blade is unbalanced or damaged.	SOLUTION: Add balance weights, or replace the damaged fan blade.
The fan motor shaft has bent.	SOLUTION: Replace the fan motor and blade.
The fan shaft is rubbing, or the fan blade is hitting.	SOLUTION: Center the fan motor, and provide sufficient running clearance for the fan blade.
The fan motor bracket is loose.	SOLUTION: Tighten the motor mounting screws.
There is moisture on the fan blade.	SOLUTION: Heat up the test chamber.
CO2 "snow" is on the fan blade.	SOLUTION: Heat up the test chamber.

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A unit may start vibrating or making noises when the circulation fan motor is running rough.