... ,Low noise, 2.Used in furnance ,boiler,and forced ventilation 3.ISO&CE industrial furnace boiler suction fans Company profile:XinXiang blower ... air inlet and impeller gap between size, and keep axis horizontal position2. When Install air inlet pipe, you can directly use ... Angle, back cover properly rotary can keep plate in a horizontal position.4. After installation, rotating rotor by hand or lever ...