Ma'anar ƙamus na "ɗaki mai tsafta" yana nufin yanayi mai sarrafawa wanda ba shi da ƙura, barbashi, ko wasu gurɓatawa. A cikin ma'anar fasaha, ɗaki mai tsabta wuri ne inda ake sarrafa ƙaddamar da ƙwayoyin iska zuwa ƙayyadaddun iyaka. Yawancin lokaci ana amfani da shi a cikin tsarin kimiyya, likitanci, ko masana'antu inda yanayin rashin gurɓatawa ya zama dole don bincike, masana'anta, ko wasu matakai. Ana amfani da ɗakuna masu tsafta sau da yawa a masana'antar semiconductor, magunguna, fasahar kere-kere, sararin samaniya, da sauran fagage inda ake buƙatar daidaitattun yanayi da mara kyau.