You can find these very useful accessories in fireplace specialty stores or even some hardware stores and big box home centers as well. A search done on your favorite search engine will provide information on where you can purchase them as well. You can even buy them online but keep in mind that you will pay shipping and handling charges as well.
While modern fireplace gives us some benefit, it can do as some hassle also. Firstly, it is a little bit expensive. Also, if they are not properly being taken care of, they may be prone to failure because they are mechanically-oriented. Since it is a mechanical machine, it needs electricity to power up the various parts of the machine such as the fans, motors, etc. So, this device cannot be used if there is power brown out.