Mann + Hummel's combfilter rau tsheb sab hauv yog ib feem ntawm cov kev tshawb fawb tshwj xeeb hauv University of Heidelberg uas tau pom tias cov combfilter txo cov concentration ntawm nitrogen dioxide hauv lub tsheb sab hauv los ntawm ntau dua 90%.

Txhawm rau tiv thaiv cov neeg nyob hauv tsev los ntawm cov pa phem thiab cov ntxhiab tsw phem, cov combifilter muaj kwv yees li 140 g ntawm cov pa roj carbon activated. Qhov no muaj ib lub moj khaum uas npog ib ncig ntawm 140,000 m² ntawm thaj chaw sab hauv, piv rau qhov loj ntawm 20 qhov chaw ncaws pob.

Sai li nitrogen oxides tsoo cov pa roj carbon activated, qee qhov tau daig hauv qhov hws thiab yog lub cev adsorbed nyob ntawd. Lwm qhov reacts nrog cov av noo nyob rau hauv cov huab cua, tsim nitrous acid, uas tseem nyob rau hauv lub lim. Tsis tas li ntawd, cov tshuaj lom nitrogen dioxide raug txo kom nitrogen monoxide hauv cov tshuaj tiv thaiv catalytic. Qhov no txhais tau hais tias Mann + Hummel particle lim tuaj yeem txo cov pa phem thiab cov ntxhiab tsw ntxhiab los ntawm ntau dua 90% piv rau cov pa lim lim.

Lub combifilter tseem thaiv cov plua plav zoo thiab cov lim dej biofunctional khaws cov tshuaj allergens thiab cov kab mob aerosols thaum cov txheej tshwj xeeb tiv thaiv kev loj hlob ntawm cov kab mob thiab pwm.