• Skip to primary navigation
  • Skip to main content
  • Skip to footer
  • MARKETS & PRODUCTS
    • Markets


      Construction

      Cybersecurity

      Fixed Gas & Flame Detection

      General Industry

      Healthcare

      HVAC-R

      Oil & Gas

      Training

      Utilities

      Products


      Combustion Analysis

      Confined Space

      Connected Work

      Corporate

      Fall Protection

      Fixed Gas & Flame Detection

      Gas Analysis

      General

      Head Protection

      Heat Stress

      Leak Detection

      Portable Gas Detection

      Refrigerant Analysis

      Respiratory Protection

      Column
  • SUBSCRIBE

Horrors of HVAC: A Clogged Air Filter

3 Min Read | Oct 31, 2022

Reading Time: 3 minutes Our story begins when an HVAC technician received a call from a homeowner stating that their furnace is running, but no heat was traveling through the vents. After troubleshooting, the technician made a terrifying discovery. With several pets in the house, over time the air filter had accumulated an immense amount of pet hair and dust preventing almost all air flow through the furnace. The technician got to work replacing the air filter, clearing out the registers, and cleaning the blower and burners.

October 31, 2022 by msasafety

Reading Time: 3 minutes
Clogged Air Filter Horror

This true incident is scary enough to spook any HVAC tech! Read ahead – if you dare.

Our story begins when an HVAC technician received a call from a homeowner stating that their furnace is running, but no heat was traveling through the vents. After troubleshooting, the technician made a terrifying discovery.

With several pets in the house, over time the air filter had accumulated an immense amount of pet hair and dust preventing almost all air flow through the furnace. The technician got to work replacing the air filter, clearing out the registers, and cleaning the blower and burners.

Why is this tale so horrifying?

Even though the solution was straightforward, this situation was extremely dangerous for the occupants, and easily preventable. A furnace running with a clogged air filter is starved for ventilation and produces high levels of carbon monoxide (CO) – a colorless, odorless gas than can be fatal for humans and their pets. A clogged air filter can also increase the chances of a fire, further advancing the safety concerns in this home.

Clogged air filters prevent furnaces from running properly and reduce the life of the system. The blower, heat exchanger, burners and other components are all crucial for heating your space. A clogged system puts unnecessary stress on these components, and heating systems are not cheap to replace.

Additionally, furnaces will run longer to compensate a clogged air filter. This increases fuel usage, resulting in higher gas bills and wasted natural resources.

Should you be scared?

While the safety concerns tied to a clogged air filter are very real – there are a few things you can do to increase the safety in your home.

Change Your Air Filter

Air filters should be replaced every 3-4 months and more frequently if you have pets in the home. If the season is changing, it’s a good time to change your air filter as well.

Check Your Heating System

Call your HVAC technician to complete a combustion analysis test on your system. HVAC professionals recommend yearly tune ups. Click here to learn more about combustion analysis.

Be Aware of Your Home

In the story above, the homeowner called a technician because they realized heat wasn’t blowing through the vents. Be aware of changes in your home and call a technician if anything feels wrong. It’s always better to be safe than sorry!

Education is Key

Learning more about your heating system can help you be prepared if something goes awry. Carbon monoxide is often called the silent killer because of its tasteless, ordorless, and invisible qualities. Educate yourself and your family on the signs of CO poisoning so you’re prepared if anything feels wrong. Common symptoms include headache, dizziness, weakness, upset stomach or chest pain. If everyone in your home feels sleepy at an odd time of day – it may be a sign. In these situations, immediately remove yourself from the home and call 911.

By continuing to care for your heating system and staying attentive, you help increase the safety of your home while keeping you and your family comfortable.Want to learn more? Check out our robust line of combustion analyzers here. 

Recommended for You

HVAC-R

How to Track Refrigerant Usage

November 12, 2024
5 Min Read
HVAC-R

Refrigerant Tracking and Compliance Software: An Overview

January 15, 2025
Watch
HVAC-R

MSA Chillgard 5000 and Bacharach Halogen Multi-Zone: Targeted Excellence in the HVAC-R Industry

February 7, 2024
3 Min Read
HVAC-R

New Rules of Refrigeration Leak Protection: What You Should Know

January 16, 2024
3 Min Read
Share:

Footer

MSA MISSION: That men and women may work in safety and that they, their families, and their communities may live in health throughout the world.

MSASafety.com

  • Construction
  • General Industry
  • Oil & Gas
  • HVAC-R
  • Utilities
  • Fixed Gas & Flame Detection
  • Fire Service
MSA on Facebook   MSA on X   MSA on Instagram   MSA on LinkedIn   MSA on YouTube  

Contact

  • blog@msasafety.com
  • 1-800-672-2222
  • View All Contact Info
  • Subscribe

Other MSA Blogs

  • Fire Service – The Scene
  • FieldServer – The Safety Connection

© 2024 MSA. All rights reserved.

© 2025 MSA . All rights reserved.

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More
Privacy & Cookies Policy

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Non-necessary
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
SAVE & ACCEPT