The airflow velocity vectors determined under the TLA cooled air supply nozzle.

<p>Displayed are measured positions: 23 cm above the nose tip (X = 0, Y = 0, Z = 0.23m), 8 cm above the nose tip (X = 0, Y = 0, Z = 0.08m), right and left side of the face (X = 0, Y = ±0.2, Z = 0.08) and (X = 0, Y = ±0.3, Z = 0.08m).</p

Location of anemometer sensors for the ACS for three tested ventilation settings.

<p>Location of anemometer sensors for the ACS for three tested ventilation settings.</p

Variations of particle concentrations in the breathing zone when air cleaner (setting B) and TLA device (setting C) was used and duvet was lifted periodically.

<p>Variations of particle concentrations in the breathing zone when air cleaner (setting B) and TLA device (setting C) was used and duvet was lifted periodically.</p

Overall particle distribution over the entire measurement period with periodic movements.

<p>Measuring interval: 23 s, i.e. 479 measurements for each particle size bin interval.</p

Experimental chamber setup.

<p>Experimental chamber setup.</p

Results from airflow characteristics study for tested ventilation settings A, B and C.

<p>Results from airflow characteristics study for tested ventilation settings A, B and C.</p

Experimental setup of the TLA device.

<p>Experimental setup of the TLA device.</p

Time series variation of concentrations of two particle size fractions in the breathing zone with three different treatments applied.

<p>A) without air cleaner, B) with room air cleaner and C) with TLA device. (Fraction 1 includes the particles between 0.3 and 0.5 μm. Fraction 2 includes the particles larger than 0.5 μm.)</p