Features of Holtop heat/energy recovery ventilator(HRV/ERV) 1. Wide range of airflow, suitable for more application 2. High efficiency, over 70% 3. Perfect silence design 4. Air filtration and purification 5. By-pass function 6. High airproof feature and easy maintenance Technical parameters ModelAirflow(CMH)External pressure (Pa) Temp. Eff. (%) Noise dB(A)Current (A) Rated power (W) N.W. (kg) XHBX-D2TH150/200/20060/70/7577/72/7222/25/270.52025XHBX-D3TH250/300/30075/82/8574/71/7123/27/300.564029XHBX-D4TH350/400/40080/85/8876/70/7025/29/320.728037XHBX-D6TH500/600/60089/92/9775/72/7225/31/350.9612043XHBX-D8TH700/800/80092/96/10077/70/7032/37/391.736071XHBX-D10TH900/1000/100080/85/8678/72/7232/36/402.136083XHBX-D13TH1000/1300/130075/85/9074/70/7037/40/423.440075