A motorized air filtering equipment, the fan filter unit removes harmful airborne particles from the recirculating air in a system. Located within a grid, the unit is typically installed at the bottom of the system. A fan filter unit can either be variable-torque or EC, depending on its design. The following are a few tips to help you choose the correct fan filter unit for your cleanroom. In addition, we will discuss the best locations in the cleanroom for a fan filter unit.
Variable-torque motors
A variable-torque motor is a common choice for fan filter units. A constant-torque motor is a more affordable alternative to a VFD. Its variable-torque capabilities can be adjusted to suit the fan filter unit’s needs. However, it is important to keep in mind that the VFD can under or over-speed the motor. If the fan filter unit runs at low airflow, it may overheat or shut down resulting in an electrical malfunction.
A constant-torque motor is a better option for a fan filter unit because it maintains torque and rotational force independent of static pressure. To use a constant-torque motor, you should first install a venturi valve or upstream pressure-independent terminal. Do not duct a fan filter unit directly to the upstream terminal, as this can lead to airflow oscillation and poor performance.
EC motors
An EC motor for fan filter unit reduces the load on the cooling system by minimizing waste heat. An EC motor runs at reduced speeds and is highly efficient, resulting in less sound energy. They are also more energy efficient than conventional fans, and their lower speed allows them to be adjusted to meet the current needs of the air handling unit. The cost benefits of switching to an EC motor for fan filter unit are obvious, and they also save money in the long run.
EC-Motors require matching drive controllers, which generate the supply voltage required by the EC-motor. These controllers are made up of two separate parts, which must be controlled in a gentle start-stop sequence to avoid damage to the EC-motor. The EC-drive technology is easily implementable, with control options ranging from analogue 0-10V signals to a BUS interface.
Standard induction motors
A fan filter unit can use a conventional induction motor or a higher-efficiency electronic commutated motor (ECM). An EC or ECM motor is a brushless DC motor with onboard microprocessors to control its speed and torque. The cost difference between an ECM and PSC motor is often paid for within the first year of operation. An ECM can be programmed with a constant torque program for torque that is independent of static pressure. An EC motor also requires an upstream pressure independent terminal. A fan filter unit with this configuration must also have a venturi valve for constant airflow through the unit.
Envirco’s MAC 10(r) IQ uses an advanced microcomputer and EC motor to maintain airflow even in a high-efficiency room. The MAC 10(r) IQ features an EC motor with built-in intelligent control that automatically adjusts torque and speed. The Mac 10IQ’s EC motor can be controlled digitally, allowing the filter to operate at its specified speed and torque.
Cost
One of the most common questions asked when purchasing a fan filter unit is: “How much does a fan filter unit cost?” The answer to this question depends on a number of factors. Listed below are 5 of the biggest factors that contribute to the cost of fan filter units. The material of the unit itself is also an important factor. Stainless steel, for example, is a corrosion-resistant metal with excellent performance stability. Many of these units are a good choice for cleanrooms.
The cost of a fan filter unit is estimated between 150 and 400 dollars. A good supplier of these units is Vietnam Cleanroom. You’ll save a great deal of money by purchasing them directly from the manufacturer. Vietnam Cleanroom’s fan filter units are priced competitively. However, you’ll need to consider the cost of installation and service. To ensure the unit’s longevity, you’ll need to perform periodic cleanings.
Installation
If you are planning to install a fan filter unit in your HVAC system, you should follow the service manual and installation instructions. It should be noted that the fan filter unit comes with clean filters and will require a 24 x 48 Volt RSR for proper operation. It can be operated by a 45-135 ECM% motor, which provides constant torque and 7.63 CFM of air flow. However, if you don’t have the necessary skills, you can hire an electrician or service technician to install the fan filter unit.
After you have received the fan filter unit, follow the service instructions to install the fan and the ductwork. It is best to have an electrician perform the installation, as it is required to be done in a proper manner. If you are not sure of the procedure, contact the manufacturer of the fan filter unit for assistance. Moreover, when you hire an electrician, make sure that they are qualified and have the required experience. They must use original spare parts.