See what it fits: PureFlow by Premium Guard with 4 filtration stages - 1st stage PureFlow High Efficiency HEPA filtration media that captures microscopic all particles. 2nd & 3rd Stage Activated Charcoal layer that block dangerous gases – e.g. carbon monoxide , sulfur dioxide. This layer is combined with baking soda to absorb bad smells. 4th layer of advanced protection. Captures microscopic particles such as smoke as well as large particles like ragweed
