Operation of ventilation systems in times of Coronavirus and other viral contaminations

Regardless of the manufacturer of a ventilation or air conditioning system, ventilation systems pose a potential risk to human health if maintenance is unsuitable. To reduce the existing risks, operators are obliged to carry out a risk analysis and to set up the maintenance cycles in accordance with the manufacturer’s minimum specifications and to implement accordingly. It must be taken-into-account which type of ventilation system is operated. In a pure air circulation system, the air must be freed of dust [...]


The speed a synchronous motor will run can be determined by the number of poles of the motor and the frequency of the electrical service using the formula: RPM = Hz* (2 / poles) * 60 where RPM = shaft rotation speed or revolutions per minute Hz = frequency or cycles/sec Poles = number of poles of your motor. So, for example, if you have a 4 pole motor on 60 Hz then RPM=60*(2/4)*60=1800 rpm. 60Hz is the most common frequency in the US 50Hz is the [...]

The advantages of copper wire motor – Decent Machinery

Copper has one of the highest electrical conductivity rates among metals, which allows it to be soldered with ease. It also makes it possible for smaller conductors to be used to transmit power loads. Smaller conductors are easier to transport and install, and they cost less, which helps manage wiring costs. Copper doesn’t undergo the same extreme expansion and contraction cycles as aluminum so it is a more stable material to use. Due to its high ductile properties, copper can be [...]

How to Confirm the Centrifugal Fan Outlet Angle?

How to Confirm the Centrifugal Fan Outlet Angle? Fan rotation is determined by looking at the fan from the drive end. For centrifugal fans, discharge is the direction the fan outlet points. Specification of the rotation and discharge when ordering a housed centrifugal fan is required so that the fan will fit in your system properly. From the motor side to look the centrifugal blower,  1. If the centrifugal fan impeller clockwise rotation, it is right. The air outlet towards to the left horizontally: [...]

Comparison between Axial fans and Centrifugal fans

There are many industrial fans manufacturers, but what do they do really. In reference markets, the term “industrial fan” does not have a clear definition and in this article, we want to explain what are industrial fans and answer to many other questions. There are only two basic types of industrial fans: Axial Fans and Centrifugal fans. The other many fans and blowers fall under various classifications like Industrial Blowers, Industrial Ventilation Fans, Exhaust Blowers, Industrial Exhaust Fans, HVAC fans [...]

The main parameters for a fan

The main parameters, characteristic to a fan, are four in number Capacity (V) Pressure (p) Efficiency (η) Speed of rotation (Rpm)   Capacity The capacity is the quantity of fluid moved by the fan, in volume, within a unit of time, and it is usually expressed in m3/h, m3/min., m3/sec. Pressure The total pressure (pt) is the sum of the static pressure (pst), i.e. the energy required to withstand opposite frictions from the system, and the dynamic pressure (Pd) or kinetic energy imparted to the moving fluid (pt = [...]

Belt Drive vs Direct Drive

Direct Drive is more typical on smaller blowers and generally offers lower cost, fewer components to assemble, greater efficiency (no drive losses), reduced maintenance (no separate bearings or belts) and greater reliability. Belt Drive offers greater flexibility in matching airflow requirements when equipped with a variable pitch motor pulley and is typical of larger blowers. When equipped with a variable frequency drive (three-phase blowers), direct drive blowers can offer the flexibility of belt drive blowers.   Belt Drive: Direct Drive:   Transmission losses Belts require tightening and eventual replacement Belt [...]

Centrifugal fans impellers types.

Centrifugal fans impellers or blades can be divided in to following several types with different functions and specific purpose:   Radial Blades  These are high-pressure fans with medium airflow. Radial-bladed fans are best for industrial applications where there is dust, or in environments where there is gas or moisture in the air.   Forward Curve Blades  These are medium pressure, high airflow fans that can be used in both clean air, ventilating and exhaust applications.   Backward Curve Blades  These are high-pressure, high flow, high efficiency fans. Power reduces as flow increases [...]

Function of PA & SA Blowers and Fans in Steam Boiler Thermal Power Plants

The function of PA & SA Blowers and Fans in Steam Boiler Thermal Power Plants There are 3 basic things are needed for the combustion of any fuel to take place, Fuel Air (Oxygen to specific) and heat In fact, some of the air which has been provided for combustion goes unreacted with the fuel. As the quantity of fuel that is fed at once and variation in the sizes of fuel particles, some of the extra air must be provided to compensate for an air that [...]

What is the difference between ID fan and FD fan?

The difference between ID fan and FD fan ID fan is basically mentioned here for Induced draft fan and ID fan is always located between dust collector and chimney. ID fan will take the hot flue gases from furnace via dust collector (dust separation system or Fume Extraction system) and will deliver to the chimney. ID fan will handle the flue gases i.e. hot air. ID fan will produce the pressure lower than the atmospheric pressure in the system or we [...]

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