Common Myths About Makeup Air Systems Debunked

One of the most common misconceptions is that makeup air systems are only required in large, custom-built, single-family homes. While makeup air systems are certainly important in expansive homes with complex ventilation needs, they are equally crucial in smaller homes, especially those that have been built or renovated with a focus on energy efficiency. 

Modern homes are built with tighter envelopes to conserve energy, which limits infiltration. Makeup air systems become essential in these homes, particularly when powerful kitchen range hoods—remove large amounts of air. Without makeup air, the home can experience negative pressure, which can lead to back drafting of combustion appliances, uncontrollable air intake, and energy inefficiencies. According to the U.S. Environmental Protection Agency (EPA), ensuring a balanced air exchange is critical for preventing these issues. 

The perception that makeup air systems are costly and complex to install is another common myth. Modern makeup air systems, such as unitary solutions designed to replace large amounts of air, are engineered to be easy to install and require only a single penetration to the exterior of the home. This simplicity not only reduces labor costs but also speeds up installation time. 

Furthermore, these systems don't condition the air, which keeps the overall costs down. However, for homes in colder climates, heater accessories are available to temper the incoming air. This optional heater can be integrated into the system to ensure that cold outdoor air doesn't reduce comfort during the winter months. This flexibility allows HVAC contractors to customize installations based on regional climate needs without adding unnecessary complexity. 

This myth couldn't be further from the truth. In fact, makeup air systems are especially crucial in tightly built, energy-efficient homes. Modern construction techniques focus on creating airtight buildings to minimize energy loss, but this also means these homes lack natural ventilation, which was more common in older, draftier homes. 

When kitchen range hoods or other high-powered kitchen exhaust systems are running, tightly sealed homes can quickly develop negative pressure, leading to potential air quality and comfort issues. A makeup air system restores balance by bringing fresh outdoor air into the home to replace what’s been exhausted, maintaining proper indoor air quality and preventing drafts or backdrafting. This ensures a safe, comfortable environment while meeting building code requirements.