A Guide to Inline Blowers

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Last updated: 
March 21, 2024

The Importance of Inline Blowers for Home Ventilation

Why Air Circulation Matters

Clean and fresh air is essential for maintaining a healthy home environment. However, many homeowners focus on insulating their houses to lower heating and electricity bills, which can lead to poor air circulation. Over-insulation can make a house airtight, preventing air from circulating between the inside and outside of the house. According to the Environmental Protection Agency (EPA), indoor air pollution can be 2-5 times higher than outdoor levels, and poor ventilation is a major contributor to this problem . Stale air can lead to health problems such as asthma and allergies, but fortunately, there is a simple solution – ventilators.

What are Inline Blowers?

Inline blowers are a type of ventilator that consists of a large fan located inside your ventilation system, typically in your kitchen or bathroom. When installed in the kitchen, it is usually placed in the range hood exhaust, directly inside the ducting or conduit line that drives all the air outside. These blowers exhaust moisture, steam, and bad odors, keeping your house healthy and well-ventilated.

Are Inline Fans Quiet?

If installed correctly, inline fans can be very quiet. However, outdoor fans, such as those in your garden, can be the loudest. To reduce noise, you can try the following tricks:

  • Place the fan inside a cardboard or insulated wooden box, leaving one side open for airflow.
  • Attach a speed controller to your fan, allowing you to use a larger fan at a lower, quieter speed.
  • Use a duct silencer between the carbon filter and the fan to reduce noise significantly.

Do Inline Fans Use Filters?

Yes, inline fans typically use carbon filters, which are best at filtering out impurities from both air and water-based environments. Carbon filters are made of extruded granular activated charcoal and can eliminate chlorine, sediment, volatile organic compounds, taste from water, and odors from the air. These filters are normally attached to the inside of the extractor fan.

Types of Inline Blowers

Inline blowers come in various types, each with its own characteristics and applications:

  • Axial and propeller fans: Air flows parallel to the shaft, and they are classified according to their wheel type (C-wheel, A-wheel, or K-wheel).
  • Centrifugal fans (radial fans): Air flows in a radial direction relative to the shaft, and they are classified by their wheel type (F-wheel, B-wheel, P-wheel, or T-wheel).
  • Combo flow fans: Air flows in both axial and radial directions, providing higher pressure than simple fans.
  • Cross-flow fans: Air flows inwardly and then outwardly in a radial direction.
  • Ducted fans: Used for aircraft, these electric fans have a higher thrust-to-weight ratio by design.

External Factors Influencing Inline Blowers

Inline blowers are influenced by external factors, primarily air conditions. If the fan is working outside of Normal Temperature and Pressure (NTP) conditions (68°F, 9.92 inches Hg, 0.075 pounds per cubic foot), it may not deliver the promised quality. Temperature and pressure vary due to air density and location (altitude or elevation above sea level). Keep these factors in mind when operating your fan:

  • Hot air and low air density result in less air mass being transported through the fan.
  • Cold air and high air density result in more air mass being transported.
  • Equal speed and dimensions mean that the volume of the flow will remain constant.

Uses of Fans Around the House and Garden

Inline blowers can be used in various areas of your home to improve ventilation and air quality:

  • Bathroom: Installing an exhaust fan in the bathroom protects against unpleasant odors, moisture, and mold growth. It also helps prevent paint from peeling and doors from warping.
  • Kitchen: Exhaust fans in the kitchen gather and release smoke, grease particles, fumes, vapors, and bad smells associated with cooking.
  • Indoor swimming pool, greenhouse, or sunroom: Inline blowers can help reduce unwanted heat, keep moisture and steam away, and allow for better temperature control in these areas.
  • Leaf blowers: Fans can be installed into leaf blowers as a duct booster fan to increase the machine's capacity.

Top Commercial Fan Brands

When choosing an inline blower, consider factors such as room size, required airflow, moisture levels, and budget. Some top brands in the industry include:

  • Panasonic - Known for their WhisperLine inline fan, which offers easy installation, quiet operation, and adjustable airflow control.
  • Fantech USA - Offers a wide range of axial, residential, commercial, and power roof ventilators.
  • Greenheck - Provides affordable fans, dampers, louvers, kitchen ventilation hoods, energy recovery, and make-up air units.
  • Vent-Axia - Claims to produce the world's quietest fan, complete with a muffler, easy setup, and a timer.
  • Vortex Fans - Offers fans, motors for DIY enthusiasts, accessories, and various kits. Some of their fans run on fuel, while most are electric.

Other notable brands include Elicent, NuTone, Suncourt, Broan, HVAC Quick, Hydrofarm, and Lowes.


Installing an inline blower in your bathroom or kitchen is crucial for maintaining clean and fresh air in your home, especially during winter when houses are tightly sealed against the cold. By choosing the right fan for your needs and budget, you can improve your home's air quality and create a healthier living environment for you and your family.

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