What is NEGATIVE PRESSURE FAN?

A negative pressure fan, also known as an exhaust fan or extractor fan, is a type of ventilation fan designed to create negative pressure within a confined space. It operates by extracting air from the enclosed area, causing the air pressure inside the space to be lower than the air pressure outside. As a result, air from outside the space is drawn into the area to equalize the pressure, which helps to remove unwanted or contaminated air from the space.

Negative pressure fans are commonly used in various applications to improve indoor air quality, control odors, and remove pollutants, dust, fumes, or excess heat. They play a crucial role in ventilation systems, particularly in places where the air needs to be constantly refreshed or where certain air contaminants need to be effectively removed.

Key features of negative pressure fans include:

1. Extraction Capability: These fans are designed to efficiently extract air from the enclosed space, pulling it towards the outside environment.

2. Ducted Setup: Negative pressure fans are often used with ducting to direct the extracted air to specific areas or to connect with air purification systems, such as air filters or scrubbers.

3. Variable Sizes: Negative pressure fans are available in various sizes, catering to different ventilation needs, from small residential units to large industrial systems.

4. Speed Control: Many modern negative pressure fans come with speed control options, allowing users to adjust the fan's speed based on the specific requirements of the ventilation system.

5. Application Diversity: These fans are used in a wide range of settings, including residential homes, commercial buildings, industrial facilities, laboratories, hospitals, and more.

It's important to note that while negative pressure fans can be highly effective in removing contaminants and maintaining good indoor air quality, they must be properly sized and installed to ensure their efficiency and safety. Improper use or installation of negative pressure fans can lead to inadequate ventilation or the potential for backdraft, where hazardous fumes or gases may be drawn back into the space.