Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: does it run off a battery or off AC power?
Document: We love the fan, which works nicely in our small bathroom (which is not vented to the outside). Unfortunately, the second day we had it, it was accidentally left on at high speed all day while we were out, and it now makes an unpleasant noise while running at high speed. So we run it only at low speed, which works fine, but it is annoying that a new fan would be so easily disabled.
We bought this fan for our nook area in our bungalow where our bed sits. I love it! My husband said the install went easy and it's very very quiet. As far as how much air it pushes we have a disagreement here. For a petite woman, it's just enough to keep me cool at night. For my husband, he thinks it's not enough. Overall it's the right fan for what we needed. Moving the air in that small space and cooling us down at night.
This fan is perfect for the bathroom. It cools quietly without creating too much airflow. We are very satisfied with our Monte Carlo Mini Ceiling Fan.
It's a nice little fan with one small potential problem (see 4 star review by "Joe" and my comments to it). I've installed numerous ceiling fans and it takes time, even with these little ones...I installed two. The instructions are pretty bad but you should be able to figure it out. For that and the other issue I can only give 3 stars, though I would like to give 5.
I INSTALLED THIS IN MY KITCHEN! it works so great til, I had to order a 2nd one for the space. they are so small and powerful! LOVE IT!
Fans are measured from tip to tip and if you pull out a ruler, you'll see that 20 inches is not a lot (especially in the fan world). It does move air nicely, is extremely compact and fits in spaces other fans will not (which is the strongest selling point). The fan blades are plastic and don't stand out as being over the top in quality, but they do the job for the size.
Answer: no