Aia ʻo Beijing Tongdy Sensing Technology Corporation ma ke alo o ka HVAC a me ka ʻenehana nānā ʻana i ka maikaʻi o loko (IAQ) no nā makahiki he ʻumi. ʻO kā lākou huahana hou loa, ʻo EM21 ka nānā ʻana i ka maikaʻi o ka ea o loko, e hoʻokō me nā kūlana CE, FCC, WELL V2, a me LEED V4, hāʻawi ...
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