Mifeng, inotungamira kugadzira zvigadzirwa zvemhepo kubva 2003, inodada kuunza iyo Inline Duct Fan.Iyi feni inosanganisa kutonhora kwakanaka neakadzika ruzha mazinga uye inoyevedza dhizaini inokodzera chero nzvimbo.Iine hukuru hwakasiyana huripo, fan iyi yakanakira kukura matende, attics, magaraji, ...
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