The BLOTMC fan kit is designed to fit a number of fireplaces, including models from Monessen, Vermont Castings and Majestic. The blower kit includes all of the components you'll need to successfully install a blower into your fireplace for the first time. The BLOTMC kit is designed using a thermostatic on/off switch, which will automatically turn the blower on and off at set temperatures. Because of this feature, the BLOTMC kit can be used with or without a designated wall switch that controls the electrical outlet below your fireplace. Additionally, there are two blower size options available. The standard sized BLOT blower is 15", which fits a majority of the fireplaces that use the BLOT kit. However, if space is limited, we do offer a reduced length 12.5" blower. Before choosing the larger 15" blower option, please be sure that your fireplace has room to accommodate the larger blower. A fireplace blower kit is an efficient and affordable way for you to finally take advantage of your fireplace's wasted heat energy. A properly installed blower kit will last for years and provide your home with energy saving heat.