No, HVAC air filters vary in quality, dimensions, and features. In most cases, it's best to use the filter that your HVAC manufacturer recommends for your system. The nominal size is a rounded estimate that is used for consistency and to avoid confusion for consumers. It's important to understand the differences between air conditioner and oven filters, as well as why filters are so important to your HVAC system.
We measure how well an air filter removes dust, pollen, and smoke from the air, and we see how freely air flows through the filter at any fan speed. You can describe the filter based on the current season, calling it an oven filter in winter and an air conditioning filter in summer. Or, thanks to today's smart home technology, you can even purchase smart filters such as 3M Filtrete smart air filters that use sensors to monitor airflow. Note that the sizes of the air conditioner and oven filters must be smaller than the dimensions of the filter compartment.
But when it comes time to replace it, does it really matter what type of filter you choose? Aren't all filters basically the same? Now that you know that the air conditioner filter and the oven filter are one and the same, you may have questions about where to install the filter in your home. However, this doesn't mean you should always choose the filter with the highest MERV rating, as filters with higher MERV ratings can interrupt airflow in certain HVAC systems. It's important to refer to the instructions for your HVAC system and your specific filter for maintenance guidelines. Generally speaking, you should change filters at least every season, if not once a month. Understanding more about the sizes of air conditioning and oven filters can ensure you find the perfect size for your home.