The Carrier Bryant 49BF Humidifier Filter Replacement is also known as Carrier Bryant 318518-761. This genuine Carrier Bryant Replacement Filter has a honeycomb filtration process that helps to trap mineral contaminants. The aluminum mesh filter replacement has a distributor and metal frame conveniently located on top of the filter. A powdery substance on this humidifier filter helps water move slowly so more water can be absorbed into the air.