Other attributes to consider are listed below. Measures the amount of current used by the motor. Airflow is a truer test of effectiveness. Units with filtration systems generally cost more, but can be effective in reducing allergen in the home. Both systems work well.
Construction Can be plastic or metal.
Metal vacuum cleaner are usually more durable. Cord length Make sure that the cord is long enough for you to effectively clean one area of you home without having to change outlets. The roller with bristles under the machine that spins when the machine is on. It increased the cleaning effectiveness on carpets. Some models have vacuum areas that extend to the edge of the bottom of the machine for cleaning tight edges.