Holtop ntse tsim ib tug tshiab series ntawm tshav kub rov qab ventilators, uas yog nruab nrog high efficiency counterflow phaj hom txhuas kub exchangers. Qhov kev ua tau zoo tuaj yeem nce mus txog 85%, thiab nws yog qhov ua tau zoo ntawm cov tshuab cua sov hauv Suav teb.
