What Is a Duct Fan?
A duct fan is a type of blower used for exhausting smoke and hazardous gases in equipment ventilation exhaust ducts and onsite.
Among blowers, a rise in discharge pressure of 10 kPa or less is called a fan, while a rise in discharge pressure of 10 kPa to 100 kPa is called a blower.
The term duct in this case does not necessarily refer only to a fan used for the airflow and exhaust piping, but also to a fan with a flexible duct of discrete shape on the fan’s airflow side.
Air conditioning and ventilation equipment used in various buildings such as offices, hotels, movie theaters, and factories are sometimes called line fans.
Uses of Duct Fans
Duct fans are used to exhaust smoke, dust, noxious gases, paint odors, and heat generated on job sites and in factories, to ventilate underground or enclosed spaces for construction, etc.
In this case, instead of being installed and used at a specific location all the time, it is used in various locations with casters or a compact portable type.
Stationary Duct Fans are also sometimes used in greenhouses for vegetable cultivation, for example, as fans for photosynthesis accelerators that pump carbon dioxide gas into the greenhouse.
How to Select Duct Fans
The following points should be considered when selecting Duct Fans:
1. Power Supply Specifications
It is necessary to check the following power supply specifications in the environment where the Duct Fans will be used, and select a suitable one.
Voltage: AC100, 110, 200, 220V
Number of phases: single phase, three phase
For explosion-proof zones, an explosion-proof type should be selected. Additionally, if the fan is operated by a control system, the nominal output, load current, starting current, consumption current, etc., are also necessary pieces of information for proper selection.
2. Air Blowing Capacity
It is important to select the maximum airflow (flow rate with no obstruction at the fan suction and discharge ports) and the maximum static pressure (pressure generated when the fan suction or discharge ports are completely blocked) that are appropriate for the work and environment. Generally, characteristic graphs of airflow and static pressure as fan performance are available from the manufacturer in catalogs, etc., and should be utilized in the selection process.
3. Other
The larger the outer diameter, the larger the overall dimensions, the heavier the weight, and the higher the air volume.