4000 Dx Vocarb Carbon Replacement Filter provides an easy to install replacement filter for select air purifiers. Utilizing the replacement filter is an easy way to keep the air purification system up to date with a clean air purification system. The filter is professionally built and offers professional filtration services to air purifiers in order to help prevent dust and debris from entering the air and causing more people to get sick. The filter is especially useful for those who have allergies or problems with their lungs. The filter provides quality air control in order to provide clean fresh air in a room.