Objective

To evaluate the efficacy of the Defend 400 at reducing Particulate Matter and determine the equivalent clean air delivery rate (eCADR).

Methodology

Testing was conducted in a 16m³ environmental test chamber with polystyrene latex microspheres of 0.5 to 5.0 μm in diameter and an aerodynamic particle sizer (APS).

A TSI Aerodynamic Particle Sizer model 3321 (TSI Inc., Shoreview, MN) was used to measure particle size and concentration of PSL microspheres. The APS provided real-time aerodynamic particle characterization with a size range from 0.54-20.0 μm with 52 size bins of resolution. Sampling was continuous with a data export interval of 1 second. The APS had a continuous flow rate of 1 LPM. The APS was connected to a splitter with on/off valves in order to sample inhaled aerosols as well as ambient aerosols within the chamber.

PLS microspheres were nebulized into the test environment and one control and one test run were completed.

Summary of Results

The Defend 400 reduced PM 1 by 99.99% in 26 minutes with an eCADR of 340.7 m³/h. PM 2.5 was reduced by 99.99% in 25.9 minutes with an eCADR of 341.0 m³/h.