Air purification device for air handling units

An air handling unit, comprising:

• a casing defining a space for conditioning air, and forming an inlet and an outlet;
• a cooling coil disposed inside the casing for cooling air therein;
• a sump located below the cooling coil for collecting liquid condensing on the cooling coil;
• a supply air blower for drawing air into the casing, through the inlet, and forcing air through the cooling coil and outward through the outlet;
• a spray header secured inside the casing, adjacent the cooling coil;
• and
• a pumping system connected to the sump and to the spray header for drawing liquid solution from the sump and pumping the solution to and through the spray header, wherein the spray header flows the solution onto the cooling coil and the solution flows downward over the cooling coil and into the sump below, and the solution treats the air flowing through the cooling coil.

A method of retrofitting and using an existing air handling unit to treat air, the existing air handling unit including a casing having an inlet and an outlet, a cooling coil for cooling air, a sump located beneath the cooling coil for collecting liquid, and a supply air blower for drawing air into the inlet and, forcing the air through the heat exchanger and the cooling coil and outward through the outlet, the method comprising:

• installing a spray header inside the duct, adjacent the cooling coil;
• installing a pumping system in fluid communication with the stamp and the spray header;
• using the pumping system to conduct a liquid solution to the spray header;
• using the spray header to spray the liquid solution onto the cooling coil, wherein the liquid solution flows downward along and then off from the cooling coil to treat the air forced through the cooling coil;
• and
• using the existing sump of the air handling unit to coiled the liquid solution flowing off from the cooling coil.