| It depends on the amps that your 12V adapter puts out. Look on your fan and you will see the voltage and amp rating. Add the amp values and multiply by 1.1 in order to give you a comfort zone. If this is still below the value of amps you adapter produces then yes you can use more then one one the adapter.
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When you think you know everything they give you a Bachelor's,
When you realize that you know nothing they give you a Master's,
When you realize you know nothing but it is ok because they don't ether then you get a Doctoral. | 
