Thank you very much for viewing. I purchased this to replace the ventilation fan in my home, but I didn't use it because I moved. This time, I took it out of the box for product photography, but it is unused and brand new. The box has some minor scratches, but I believe there are no problems with the main unit, packaging, or shipping. I am a novice, so I cannot answer questions about the product details or how to install it. It is the year-end and New Year's holiday season, but I can ship until the 28th of this year and from the 4th of next year. Thank you for your consideration.