A hypoallergenic vacuum cleaner is a special type of vacuum cleaner that has been designed to help reduce the amount of allergens, like dust, pollen, pet dander, and other tiny particles, that are stirred up and spread through your home when you vacuum. They do this by trapping the allergens inside the vacuum cleaner, so you won't breathe them in. Hypoallergenic vacuum cleaners are especially useful if someone in your household has allergies.