Holmes HAP9726-U True HEPA Allergen Remover, Black Thanksgiving Prevents the reverse flow of

Prevents the reverse flow of water through backsiphonage or backpressure

Forged head nailed to handle

special center of gravity nail guides eliminates "play" in the wall

solvents and chemicals

4-pin cylinder helps prevent picking

Holmes HAP9726-U True HEPA Allergen Remover, Black Thanksgiving Prevents the reverse flow ofHighlights: Color: Black 4 Speed Recommended for medium rooms, up to 299 sq. ft. Digital display with auto off timer True HEPA Filtration removes 99. 97% of airborne allergens from the air that passes through the filter Arm & Hammer enhanced pre filter for odor control Progress Bar: Green LED: Filter is working effectively. Yellow LED: Time to purchase a new filter. Red LED: Time to replace the filter