The DOOR CONTROL line of Ozone products offers:• Floor Springs • Concealed Door Closers • Surface Mounted Door Closers.These door Closer have features like:• Fire Rated • Power Adjustable • Back check option • Delayed action option.Through the above products Ozone addresses the Door Closing needs and offers for a very large choice of functional features. Ozone balancesthe need for reliability and the desire for enhanced aesthetics