Product Features: DBF low-noise variable air volume air box is a new wind power sources, compared with conventional ventilation equipment, with air volume, low noise, small size, low power, live easy accessibility features. DF series by using low-noise fan, especially for factories, construction, education, research and office ventilation details DBF low-noise variable air volume air chassis: Our products mainly include: Fan Series: XGF (HTF ) series fire temperature exhaust fan PYHL-14A fire smoke mixed type fire ventilation fan HTFC dual low-noise wind chassis HTF (A)-I.II.III series of fire temperature exhaust axial fans HTF (B) PYHL-14A -I.II series of fire temperature exhaust Francis fan HTF-IG, IIG, D series fire temperature exhaust Francis fan HTFC-I.II.III series low noise fire ventilation (dual) cabinet centrifugal fan DXG (GDF) Series Low noise rectangular duct fans DBF series low noise centrifugal wind chassis GXF (SJG) series of pipeline oblique flow fan SWF (HL3-2A) Series high efficiency and low noise fan Francis Francis HLF series low noise wind chassis DFBZ series low noise square shaft wall Sidewall flow fan DWEX series HTFC series cabinet centrifugal blower fan, DBF series of low-noise wind chassis, HX new wind ventilators, CDZ low-noise axial fan, T35 axial fan, FT35 corrosion axial fans, BT35 proof axial fan , BFT35 flame-proof axial fans, DFBZ square wall axial fans, SWF series mixed flow fan, HL, PYHL series of energy-efficient mixed flow fan, DWT series of low-noise roof fan, BDW series fiberglass roof fan, DSF VAV fire smoke wind chassis, HTF XPZ YTPY fire temperature exhaust fan GXF series mixed flow fan, etc.; outlet series: LBC plant rain shutters, VDL swirl diffusers, DUK spherical vents; valve series: PYK multi-leaf smoke vents, butterfly, ending return valve, FH (SFVD) smoke damper, etc.; duct series: Total flange duct, inorganic fiberglass duct, WX micro-perforated muffler plenum FRP Pipe cans; air conditioner series: ZK combined air conditioning units, KD ceiling air-conditioning units, fan coil units, etc.; tank series: SMC combined water storage tanks; service: "quality first, service first" is our principle of service, where the use of our products to ensure customer satisfaction assured! I pay special attention to after-sales service system, will provide the following services promise to our customers: (1) year warranty, free on-site service within one year, except for man-made and natural causes of force majeure, the warranty period is calculated from the signature of acceptance from , during the warranty period, I will be in strict accordance with relevant laws and regulations of the People's Republic of China to provide after-sales service of the product, unless otherwise provided in the contract. (2) During the warranty period due to a failure of our products that appear, I will be five working days after receiving the notice to the field service until the fault is completely ruled out, the product is completely back to normal operation. I am responsible for the company based on the principle of long-term customer for all customers to establish a complete and detailed service files, forming a perfect science service system, has won the trust of our customers and lifetime maintenance, availability, strong service allows you to sit back and relax