page contents

Browse By

Subfloor Ventilation Guide: Centrifugal vs Inline Fans

Subfloor ventilation plays a vital role in maintaining both the health and structural integrity of a building. It’s essential to ensure proper airflow beneath the floorboards to prevent moisture buildup, mould growth, and structural damage. In this guide, we delve into the role of fans in subfloor ventilation, focusing specifically on two primary types: centrifugal fans and inline fans.

subfloor ventilation - centrifugal fans vs inline fans


Types of Subfloor Ventilation Fans

1. Centrifugal Fans

Centrifugal fans operate by creating radial airflow, generating pressure differences to circulate air effectively. Their design enables them to excel in pushing air through ducts and overcoming resistance.


Centrifugal fans offer several benefits:

  • They boast high static pressure capabilities, making them suitable for long duct runs.
  • They perform efficiently even in restricted spaces.
  • They are ideal for overcoming resistance from bends and filters.


However, there are drawbacks to consider:

  • Centrifugal fans are larger and bulkier compared to inline fans.
  • They may require more power consumption.
  • They come with a higher initial cost.


Centrifugal fans find common usage in:

  • Large subfloor areas.
  • Complex ducting layouts.
  • Commercial buildings requiring robust ventilation systems.


2. Inline Fans

Inline fans differ from centrifugal fans in their compact design and axial airflow. They are characterised by their ability to fit seamlessly within ducts.


Inline fans offer several advantages:

  • Their space-saving design makes them ideal for residential applications.
  • They operate energy-efficiently.
  • They have a lower initial cost compared to centrifugal fans.


However, they come with some limitations:

  • Inline fans have lower static pressure capabilities.
  • They are less suitable for long duct runs or environments with many bends.
  • They have limited resistance to obstacles.


Inline fans are commonly used in:

  • Residential homes.
  • Smaller subfloor spaces.
  • Simple ducting configurations.


Choosing the Right Fan


1. Subfloor Size and Layout

The size and layout of the subfloor space dictate the appropriate fan type. Larger areas may benefit from the higher static pressure capabilities of centrifugal fans, while smaller spaces can be adequately ventilated with inline fans.


2. Ducting Requirements

Consider the need for long duct runs, bends, and obstacles. Centrifugal fans are better equipped to handle complex ducting layouts, whereas inline fans are more suited to simpler configurations.


3. Budget and Energy Efficiency

Compare the initial costs and ongoing energy consumption of each fan type. While centrifugal fans may have a higher upfront cost, they could prove more energy-efficient in the long run.


Professional Consultation

Seeking guidance from HVAC professionals or building experts is highly recommended. They possess the expertise to assess specific project requirements and provide tailored recommendations. By consulting with professionals, individuals can gain valuable insights into the intricacies of subfloor ventilation and make well-informed decisions regarding fan selection. This professional assistance ensures that the chosen subfloor fan type aligns perfectly with the unique needs and challenges of the subfloor ventilation project, ultimately contributing to optimal airflow and the overall health of the building.


Why Choose Solar Whiz Subfloor Fans

Solar Whiz subfloor fans present a compelling solution for effective ventilation, leveraging solar power for energy efficiency and environmental sustainability. Their versatility allows for seamless integration into various subfloor configurations, catering to both residential and commercial needs. Operating silently and boasting durability, these subfloor fans ensure reliable performance even in harsh conditions. With advanced control options and Australian-made quality, Solar Whiz subfloor fans offer a comprehensive solution for efficient and intelligent subfloor ventilation. By choosing Solar Whiz, individuals can enjoy a cost-effective, environmentally friendly, and high-performance sub floor ventilation system tailored to their specific requirements.



Proper subfloor ventilation is crucial for maintaining a healthy and structurally sound building. By understanding the advantages and limitations of different fan types, such as centrifugal and inline fans, readers can make informed decisions to ensure optimal sub floor ventilation in their spaces. Whether opting for the robust capabilities of centrifugal fans or the energy-efficient design of Solar Whiz subfloor fans, choosing the right fan is essential for effective subfloor ventilation and overall building health.


Take the first step towards optimal subfloor ventilation by exploring the range of Solar Whiz subfloor fans today!