: The "nominal" size is a rounded number for marketing; the "actual" size is slightly smaller to ensure a snug fit. 2. Understand MERV Ratings
Your lifestyle dictates the intensity of filtration you need:
: If you use a 1-inch filter in a slot designed for 4-inch filters, it will leak air and bypass filtration. Filterbuy notes that incorrect thickness can degrade air quality and strain your system. what furnace filter to buy
: Made of polyester or cotton folds. These have more surface area, allowing them to trap more particles without instantly clogging.
: MERV 13 is excellent for asthma but should be checked for compatibility with your HVAC system’s airflow requirements. Expert Maintenance Tip : The "nominal" size is a rounded number
: Uses static electricity to attract dust like a magnet. These come in disposable or washable versions.
The first step is checking your current filter for its (e.g., 20x25x1), which is printed on the side. Filterbuy notes that incorrect thickness can degrade air
Different materials offer varying levels of filtration and durability.