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The Hidden Cost of Poor Airflow in High-Performance Commercial Buildings

Poor airflow in commercial buildings leads to higher energy bills, reduced indoor air quality, and HVAC wear. Learn how to identify and solv

Ava Montini

Mar 24, 2025

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Why airflow inefficiencies drive up costs, compromise indoor air quality, and create hidden challenges for facility managers


Most commercial and institutional buildings today are designed with performance and efficiency in mind. Energy benchmarks, ESG goals, and occupant well-being are often front and center. But despite those efforts, one critical element of building performance is consistently underdiagnosed: airflow.


Poor airflow can silently affect every corner of your building’s operations — from higher energy consumption and HVAC maintenance costs to reduced indoor air quality (IAQ) and missed sustainability opportunities. It rarely shows up as a red flag on day one, but over time, it chips away at performance in ways that are both measurable and avoidable.


Inefficient Airflow Increases Energy Use — Even in “Efficient” Buildings

In many commercial buildings, HVAC systems account for roughly 30–40% of total energy consumption, according to Natural Resources Canada and ASHRAE. But when airflow is restricted, that percentage can climb significantly.


The most common culprits are high-resistance filters, dirty or aging ductwork, unbalanced systems, or outdated fans. These conditions increase static pressure, which forces HVAC fans to work harder and longer to achieve required airflow levels.


According to a study by the U.S. National Institute of Standards and Technology (NIST), buildings with airflow-related HVAC issues can see energy use increase by up to 30% compared to optimized systems. [1]


Even minor issues can have an outsized impact. A 100,000 sq. ft. office building experiencing elevated fan energy use due to clogged filters or inefficient duct design could face annual utility costs tens of thousands of dollars higher than necessary. For building owners managing multiple sites, that inefficiency compounds quickly.


Airflow and Indoor Air Quality Are Closely Linked


Buildings are dynamic systems, and air quality tends to suffer when airflow is compromised. Insufficient airflow can lead to poor ventilation, uneven air distribution, and pockets of stagnation in rooms or zones. These areas often experience elevated levels of carbon dioxide (CO₂), volatile organic compounds (VOCs), and particulate matter — especially in high-occupancy spaces.


A 2015 study from Harvard’s T.H. Chan School of Public Health found that employees working in well-ventilated buildings performed 61% better on cognitive tasks than those in typical buildings with poor ventilation and air quality. [2]


In schools, researchers have found that students in classrooms with improved ventilation perform better on standardized tests. [3] In healthcare facilities, inadequate air movement can increase the risk of airborne illness transmission.


Common complaints like “stuffy rooms,” temperature inconsistencies, or fatigue can often be traced back to airflow and ventilation issues — even when temperature setpoints and filtration standards are technically being met.


Poor Airflow Wears Down HVAC Systems Faster


Inefficient airflow costs more on your energy bill and accelerates mechanical wear and tear. When fan motors, compressors, and dampers are forced to operate under continuous load, components degrade faster than expected.


This leads to:

  • More frequent repairs and service calls

  • Shortened equipment lifespan

  • Greater downtime and occupant discomfort during peak seasons


A study from the National Air Duct Cleaners Association (NADCA) notes that air distribution restrictions are a key factor in premature HVAC failure and reduced system capacity. [4]


The cost of replacing a rooftop unit, for example, can range from $10,000 to $25,000, depending on building size and complexity — not including indirect costs from temporary system downtime.


Sustainability Targets Can Be Quietly Undermined


Many facilities today are pursuing ESG goals, LEED certification, or local emissions reduction mandates. But airflow inefficiencies can quietly work against those targets by increasing Scope 2 emissions (energy-related emissions) and filter waste.


High-resistance air filters, mainly traditional pleated filters, can contribute to this in two ways:

  1. Increased energy use due to pressure drop

  2. Frequent changeouts, leading to more waste and landfill contribution


According to a 2021 study in Building and Environment, filter pressure drop is one of the most overlooked contributors to unnecessary HVAC energy use — especially when filters are overused or under-maintained. [5]


If a building claims progress in sustainability, it’s important to ensure that filtration and airflow practices align with those claims—both from an energy and waste standpoint.


Missed Opportunities for Incentives and Cost Recovery


One of the lesser-known downsides of inefficient airflow is the lost opportunity to qualify for energy retrofit incentives.


Many utility and government programs across North America offer rebates, grants, or low-interest financing for businesses upgrading HVAC systems, controls, and low-pressure filtration. But to be eligible, buildings often need to demonstrate quantifiable improvements in system performance.


For example, Ontario’s Save on Energy Retrofit Program offers up to 50% of project costs for energy-efficiency upgrades, including those related to ventilation, air handling units, and demand control ventilation systems. [6]


Without data on airflow improvement or energy reduction — or without addressing underlying airflow inefficiencies — buildings may fail to qualify, leaving funding on the table.


Practical Steps to Address Airflow Challenges


The good news is that improving airflow doesn’t require a major capital project. Many impactful changes can be made within existing operations and maintenance cycles.


Here’s where most facilities can start:

  • Conduct a static pressure and airflow assessment to identify bottlenecks

  • Replace high-pressure filters with low-pressure, high-efficiency alternatives

  • Balance and tune your HVAC system, especially if zones have changed due to new usage patterns

  • Install real-time IAQ monitors to detect issues as they emerge, not after complaints arise

  • Track filter changeouts and energy use to capture data for future incentive applications


These strategies are already being implemented in facilities across North America — and in most cases, they deliver measurable improvements in energy efficiency, equipment reliability, and occupant satisfaction.



Airflow may not be the most visible part of your building, but it’s one of the most influential. When ignored, it quietly drives up energy costs, reduces system lifespan, and compromises air quality.


For facility managers and business owners focused on performance, sustainability, and operational clarity, airflow should be on the radar — not just as a maintenance metric but as a lever for long-term efficiency and resilience.


Addressing airflow challenges is a straightforward, high-ROI step that supports healthier, more cost-effective, and future-ready buildings.

Ventilation and Health: Air Ventilation For Closed Room 

  • Writer: Jennifer Crowley
    Jennifer Crowley
  • Aug 2, 2023
  • 5 min read

Updated: Jul 8, 2024

Middle-aged white female massaging her eyes while holding her glasses in the other hand, clearly in discomfort
Long-term exposure to indoor air pollutants may also contribute to more severe health conditions, such as cardiovascular diseases and even certain cancers.

Take a deep breath. Can you be sure that the air you’re breathing right now is clean and fresh?


For many of us, especially those spending significant time indoors, the quality of the air we breathe can profoundly impact our overall health and well-being.

Indoor air quality is a crucial aspect of maintaining a healthy living environment. It becomes even more critical when dealing with closed rooms, where natural air circulation is limited. Below, we will explore the vital link between ventilation and health, shedding light on how closed-room air quality can significantly affect our well-being.


Throughout this article, we aim to delve into the direct and indirect health effects of poor indoor air quality in closed spaces and discuss the role of proper ventilation in ensuring a healthier and more comfortable living space.


The Link Between Indoor Air Quality and Health

Indoor air quality refers to the condition of the air within buildings and structures indoors, particularly as it relates to the health and comfort of occupants. Poor air quality can arise from various factors, such as inadequate ventilation, the presence of pollutants, and excess moisture. The consequences of breathing in polluted indoor air can be far-reaching.


Common health issues associated with poor ventilation in closed rooms include allergies, asthma exacerbation, respiratory problems, headaches, and fatigue. Long-term exposure to indoor air pollutants may also contribute to more severe health conditions, such as cardiovascular diseases and even certain cancers.

According to the World Health Organization (WHO), household air pollution was responsible for an estimated 3.2 million deaths per year in 2020, including over 237,000 deaths of children under the age of 5.


How Ventilation Impacts Indoor Air Quality

Ventilation is the process of bringing fresh outdoor air into an indoor space and removing stale air, ensuring a continuous exchange of air to maintain optimal air quality.


Adequate ventilation facilitates proper air circulation in closed rooms, preventing the accumulation of stagnant air and the buildup of pollutants. It helps distribute fresh air throughout the space, ensuring all occupants can access clean, oxygen-rich air.


One of the primary roles of ventilation is to remove indoor air pollutants. Effective ventilation systems can filter out dust, pollen, mould spores, pet dander, and other allergens, making the air healthier to breathe.


The Role of Closed Room Ventilation in Enhancing Well-being

Imagine a stuffy and poorly ventilated room where the air feels heavy and stale. Proper ventilation, on the other hand, creates a comfortable and pleasant environment. Adequate airflow can help regulate temperature, reduce humidity levels, and minimize stuffiness, contributing to an overall sense of comfort and relaxation.


The quality of the air we breathe has a direct impact on cognitive function and productivity. In well-ventilated rooms, where fresh air is consistently supplied, occupants experience improved focus, better decision-making abilities, and enhanced creativity. On the contrary, inadequate ventilation can lead to brain fog and reduced productivity.


The relationship between indoor air quality and mental health is increasingly evident. Studies have shown that exposure to clean air and natural ventilation can alleviate stress, anxiety, and depression. Good ventilation promotes a sense of openness and connection to the outdoors, which can positively affect mood and overall mental well-being.


Signs of Poor Ventilation in Closed Rooms

Identifying the signs of poor ventilation in closed rooms is crucial to address potential air quality issues.


If you or your family members experience frequent headaches, dizziness, coughing, or worsening allergies while indoors, it might indicate inadequate ventilation and poor air quality.


Additionally, these signs are usually indicative of a home that has poor ventilation:

  1. Condensation on windows and glass

  2. Discolouration of the floor, wall tiles, and grout

  3. Early signs of rust stains on plumbing

  4. Mould

  5. Strong odours that don’t dissipate

  6. Heat build-up that doesn’t dissipate


Types of Ventilation

Different types of indoor space ventilation methods are available, each offering unique benefits and suited to specific room layouts and requirements. Understanding these ventilation options can help you make an informed decision about the best system for your closed room.


1. Natural Ventilation

Natural ventilation relies on passive methods to facilitate the exchange of indoor and outdoor air. It typically involves strategically placed windows, doors, and vents to allow fresh air to enter the room and stale air to exit. The principle behind natural ventilation is based on wind pressure and temperature differences, creating a natural airflow.

Advantages

  1. Energy Efficiency: Natural ventilation doesn’t require electricity or mechanical systems, making it an eco-friendly and cost-effective option.

  2. Connection to the Outdoors: It provides a direct link to the outside environment, allowing occupants to enjoy fresh air and natural sunlight.


2. Mechanical Ventilation

Mechanical ventilation systems involve the use of fans and mechanical components to circulate and exchange air. There are three main types:

  1. Exhaust Fans: These are installed to expel indoor air and pollutants directly outside, often used in kitchens, bathrooms, and utility rooms.

  2. Supply Fans: These fans bring in fresh outdoor air and distribute it throughout the closed room. They work well in spaces with limited access to natural ventilation.

  3. Balanced Systems: Balanced ventilation systems combine both exhaust and supply fans to maintain a balanced airflow. They ensure a constant supply of fresh air while expelling stale air.

Advantages

  1. Control over Airflow: Mechanical ventilation allows precise control of airflow, enabling optimal ventilation rates.

  2. Filtering Capability: Mechanical systems can be equipped with filters to remove allergens, dust, and pollutants, enhancing indoor air quality.


3. Hybrid Ventilation

Hybrid ventilation is a blend of natural and mechanical methods. It seeks to optimize airflow and energy efficiency by adapting to varying external and internal conditions. For example, a hybrid system might use natural ventilation during mild weather and switch to mechanical ventilation during extreme weather conditions.

Advantages

  1. Energy Efficiency: Hybrid systems can reduce energy consumption by intelligently utilizing natural ventilation when conditions permit.

  2. Consistent Airflow: The combination of natural and mechanical methods ensures a steady and controlled airflow.


Tips for Improving Closed Room Air Ventilation

  1. Ensure proper airflow by keeping doors and windows open when possible to allow fresh air to circulate.

  2. Use exhaust fans in kitchens and bathrooms to remove excess moisture and odours.

  3. Consider installing a mechanical ventilation system, such as a balanced ventilation system with heat recovery, to maintain fresh air circulation in closed rooms without compromising energy efficiency.


Best Practices for Maintaining Good Air Quality in Closed Rooms

Regular Cleaning – Regularly clean and dust your living space to reduce the buildup of allergens and pollutants.

Plants and Natural Solutions – Introduce indoor plants known for their air-purifying properties, such as spider plants, peace lilies, or snake plants. Natural solutions like opening windows for cross-ventilation on breezy days can also help improve air quality.

Air Purifiers and Ventilation Systems – Consider investing in high-quality air purifiers and ventilation systems tailored to your room’s size and specific needs.

Explore expert insights, stay up to date with industry events, and gain a deeper understanding of the cutting-edge developments that are revolutionizing the indoor air quality landscape within Blade Air's comprehensive Insights Hub.

You can also subscribe to our monthly newsletter below for exclusive early access to Blade's Insights content, uncovering tomorrow's air quality advancements before they hit our Hub.

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