If your filter is facing the wrong direction, airflow will. If you are purchasing your filters from a retail store like Lowe’s or Home Depot, they may have their own rating system. Make sure your filter is pointing the correct direction and fits firmly into the filter compartment. You will want to check with your furnace manufacturer for a maximum MERV rating. A rating between eight and eleven is normally sufficient for a typical home. Align the vane wheel with the direction of airflow in order to get the most accurate readings. Air should flow from the ductwork into the. This can cause your furnace to work harder and potentially cause functioning problems. Hold the vane wheel next to the fan or duct you want to measure. Before removing the filter, take note of the airflow direction arrows, typically printed on the side of the filter. The thicker filter will undoubtedly catch more pollutants, dust, dander, hair, and the like, but may be so thick that it restricts airflow. That direction is from the cold air to the hot air duct as the air. The higher the MERV rating, the more dense, the filter. Shows correct way to insert the furnace filter by pointing the arrow towards the air flow.

Your old filter should have arrows noting what direction the air flows.

Minimum Efficiency Reporting Value or, MERV for short, is a term that measures the denseness of a filter. MERV ratings range from one to sixteen. If your filter is reusable, wash it off and replace it.

Direction of air flow furnace