Monday, November 13

What Should You Know about DOAS and Exhaust Fans before Buying?

DOAS and Exhaust Fans

Are you in the market for a new exhaust fan or DOAS system? If so, it’s essential to understand the basics of these systems before making your purchase. Exhaust fans are used for various applications, including removing smoke, fumes, and odors from commercial kitchens. DOAS systems provide ventilation and air conditioning in a single unit.

In 2020, the global Dedicated Outdoor Air System (DOAS) market size was $ 2737.9 million, and it is expected to reach $ 4815.2 million by the end of 2027.

This article will discuss the differences between Floaire exhaust fans and DOAS systems and some of the key features that you should look for when shopping for either one.

1) Exhaust Fans

Exhaust fans are an essential part of any building’s ventilation system. They help remove stale air and replace it with fresh air, which helps keep the building’s occupants healthy and comfortable. Several types of exhaust fans are available, each with its benefits.

Inline Floaire exhaust fans are installed

a) Inline Exhaust Fans

d in the ductwork between the HVAC unit and the ventilated room. They are typically used to supplement or replace existing roof exhaust fans in small to medium-sized buildings.

b) Centrifugal Exhaust Fans

Centrifugal exhaust fans are the most common type of exhaust fan. They are used in various applications, including HVAC systems, industrial process ventilation, and fume extraction.

2) DOAS Systems

A DOAS system is a great way to improve indoor air quality and reduce energy costs. However, there are a few things you should consider before buying one. First, these appliances rely on exhaust fans to remove contaminants from the air. If your home doesn’t have an existing exhaust fan, you’ll need to install one.

The systems are designed to work with a central air conditioner. If you don’t have a central air conditioner, you’ll need to purchase one to use a DOAS system. These systems can be costly to install and maintain. If you’re not sure you can afford a DOAS system, consider other options for improving indoor air quality.

These appliances are not effective at removing all contaminants from the air. If you have severe allergies or asthma, you may need additional methods to improve your air quality. For example, you need to ensure proper ventilation in your home. It can be done by opening windows or using a whole-house fan.

It would indeed be a help if you also kept your home clean to reduce the number of contaminants in the air. Vacuum regularly, dust with a damp cloth and wash surfaces with soap and water.

3) Types of DOAS Systems

1) Single Zone

A single zone DOAS system is the most common and most straightforward type of system. It provides conditioned air to a space through one or more supply fans and exhausts unconditioned air to the outdoors through an exhaust fan. Single zone DOAS systems are often used in small office buildings, retail stores, and restaurants.

2) Multi-Zone

Multi-zone systems are more expensive than single-zone systems, but they’re worth the investment if you have a large home or one with many rooms. These systems can be either ducted or ductless, and they allow you to control the temperature in each zone independently.


Whether you’re planning a new building or retrofitting an existing one, consult with an HVAC engineer early on to ensure your system will be able to accommodate a DOAS unit.

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