Using this rangehood filter is easy. Just find the right spot in your Westinghouse, Chef, or compatible rangehood, line up the central mounting hole and use the twist - lock slots to secure it in place. As it works, it will trap odors from cooking. When it comes to maintenance, check the filter regularly. If it starts to look dirty or the odor - removing ability seems to decline, it's time to replace it. Remember, it's a good idea to keep a spare on hand. And while it might fit other brands and models, always double - check compatibility before using it.