I am very upset, I bought this fan, used it for three weeks and it just stopped working. Air Flow When it was working it had very good air flow and was very quite. Ease of Use It was very easy to use once I got it put together. Durability The outside of the fan is very durable, I cannot say the same for the motor that is in the fan. I only used this fan for about three weeks and one day it just stopped working. No noise, nothing to let me know there was a problem with it. Design I liked the design of the model HF-1663. I used it to help circulate the air from my air conditioner down the hallway to the bedrooms in my apartment.