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What do you know about duct fan?

Views: 0     Author: Site Editor     Publish Time: 2022-07-20      Origin: Site


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To understand the installation of duct fans, first of all, we must have a comprehensive understanding of duct fans. The parameters of the duct fan include noise, air volume, efficiency, full pressure and motor power, etc. And consumers can choose a variety of ventilators by the physical and chemical properties of the gas being used.

  • What are the regulations for duct fan installation?

  • What are the test steps before installing the duct fan?

  • When do you need a duct fan for local air supply and exhaust?

What are the regulations for duct fan installation?

The vibration of the duct fan must meet the following five requirements. First, the frequency of the basic device should not be greater than one third of that of the motor, and the difference between the speed of the duct fan at work and the vibration speed at rest must be greater than three times. The inlet and outlet of the air duct and the duct fan should be provided with flexible joints for connection. And the device of the air inlet and outlet must have a separate support, and the casing cannot bear other weights. Installed on buildings, take vibration isolation measures. In addition, duct fans can be directly installed with straight ducts.

What are the test steps before installing the duct fan?

The exhaust air volume of the fume hood and the supplementary air volume of the room are controlled by a butterfly valve or a Venturi valve

Butterfly valve characteristics: simple structure, low cost, reliable operation, but low precision

The pressure drop of the valve is in the range of 150-750Pa, the flow has nothing to do with the pressure (to ensure the accuracy of the flow)

Air volume control is accurate to ±5% of the airflow control signal. No additional straight air ducts required before and after the valve

The valve has constant air volume and variable air volume control types to meet various control requirements of laboratory air flow. According to the requirements,

This system selects variable air volume and constant air volume Venturi valve The valve control response is fast and accurate

Control signal change reflection time: <1 second

Air duct static pressure change reflection time: <seconds Air volume control overshoot is less than ±5% Valve adjustable ratio can reach 20:1

Fume hood control configuration Dedicated fume hood control system

The fume hood controller (FHM610 controller) controls the exhaust air volume of the fume hood to ensure the average surface of the fume hood.

When do you need a duct fan for local air supply and exhaust?

In some cases, the workshop is clean as a whole, but there are a few serious pollution sources (or serious heat generation), in this case, a duct fan is needed for local exhaust.

In some cases, it is only necessary to take care of the airflow of the staff in fixed positions, and local fresh air should be adopted.

Example: In an open space, the outside temperature is very low (-30°C), but the staff needs to be heated. If you use integral heating, you can only waste energy. In this case, thermal radiation heating should be considered first, or a local duct fan can be used.

Guangzhou Meihao HVAC Equipment Co. Ltd., which has been around for more than several years, focuses on manufacturing duct fans. Here you will find the duct fan you need.

NO.C105 Yuewang building, NO.1 Wangling section of 106 national road, Baiyun district








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    Ambient air curtain; Heating air curtain (electric heating and hot/warm water heating air curtain); Horizontal mount air curtain; Vertical mount air curtain; Ceiling mount air curtain; Special air curtain series. Such as vehicle air curtain which installed on refrigeration truck, revolving door air curtain, cold room air curtain, etc. Product length from 0.6 meters to 2 meter, if there’s special needs we can provide customize service for other length. And the air curtain casing materials include steel, stainless steel, plastic, aluminum, etc. 

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