Backward without fan volute type, without constraint flow design, large range of pressure and low noise Motor direct drive, simple structure, convenient installation Suitable for variable air volume system or clean air conditioning system Detailed description: Direct-driving, simple structure, easy installation Suitable for variable stystem or purification equipment Specification: Impeller's size seperately is 200,225,250,280,315,355,400,450,500,560,630,710,800,900,1000, total 15 models Air-volume: 300-43000m3/h Total perssure: Maximum to 2000Pa - Number of blades: 7 - Max. permissible media temperature: 40°C - Min. permissible media temperature: -20°C - Impeller: Welded sheet steel coated / painted in RAL 5015 (sky blue) - PF-plug fan made as rugged bolted construction built with galvanised sheet steel - Inlet ring for optimum impeller inflow with measurement device for determining flow rate - With hub half-wedge balancing according to DIN ISO 8821, balance quality G 2.5 according to ISO 1940-1 Factory Test All of equipment is individually factory tested for safety and performance in accordance with international Standards. Each unit is shipped with a documentation outlining the tests undertaken and the units individual results for each unit. Warranty: Our equipment is warranty for 1 year excluding consumable parts and accessories. All equipment is shipped with a comprehensive use’s manual complete with a report documenting all test procedures. Additional IO/OQ/GMP document is available upon request. Contact our sales representative for specific warranty details or document request. Payment Term: T/T in advance, 30% before place the order, 70% when you see copy BL Or 30% T/T in advance before place the order, 70% LC at sight.