Alen's customized solutions for pet allergies feature HEPA-OdorCell filtration to capture pet dander, dust and pet odors in your home. These recommended air purifiers for pets also feature a Pre-Filter layer to collect larger pet dander particles and pet hair, extending the life of the HEPA filter. For heavier pet odors, like urine or other accidents, we suggest the HEPA-OdorCell Filter which neutralizes heavy pet odors at a molecular level. Alen HEPA Air Purifiers for pets are a great solution to keep your home smelling fresh and relieve pet allergy symptoms. Shop replacement HEPA-OdorCell filters here.