Mesdan developed a "Medical mask testing kit” according to EN 14683:2019 (Annex C) and ASTM F2100:2019 (point 9.2), for what refers to the differential pressure only, measuring the pressure difference above and below the specimen, used mainly for surgical masks. AIR TRONIC PLUS is a fast and silent electronic instrument to determine the air permeability (meant as speed of the air flow vertically passing through the sample under preset and known testing conditions) of woven, knitted and non-woven fabrics, industrial fabrics for technical use, artificial leather, felt, velvet and paper. It can calculate also the average pore size of woven fabrics, a unique feature important for the filtration industry, their evaluation and classification. The evaluation of the porosity parameters (number, size, and distribution of pores) of woven fabrics plays a crucial role during their usage. The porosity strongly influences many permeability properties like air and other gases, water and other liquids, water vapor and heat, bacteria, sound, UV light, etc. AIR TRONIC PLUS is equipped with wheels, as well as a user-friendly touch screen display, a built-in suction unit with cooling system (granting a noise level reduction of about 20-30 dB, in comparison with the "standard models”), and a digital Flux Meter (to perform fast tests). The air permeability value is expressed in mm/sec. and, thanks to the different testing template areas supplied with the instrument, the air permeability range is extremely wide and goes from a minimum of 1.4 mm/sec up to a maximum of 8056 mm/sec**. The air permeability value can be also expressed in m/sec., l/minutes, and other measure units. * Special model, which conforms to ASTM D3574 as well (in addition to all other Standards of models 3240E and 3240G). ** The air permeability range of model 3240G, for highly impermeable fabrics (like parachutes), goes from a minimum of 1.4 mm/sec up to a maximum of 500.000 mm/sec. Remarks: bench model also available on demand (Code 3240B).

AIR TRONIC PLUSDescription / Testing procedure The instrument is operated through a user-friendly touch screen display, that allows the operator to set and enter the following test parameters: • Testing area (expressed in cm2). • Pressure drop, expressed in Pascal, continuously adjustable (from 0 Pa to the max. value). • Air permeability measuring unit (expressed in mm/sec., m/sec., l/min.). • Measuring volume (either 10 litres or 100 litres must be selected). At the end of the testing procedure, a test report can be printed by means of the built-in Micro printer (Code 3240.2), available as optional....