Furnace Filter Air Flow Resistance

When changing furnace filters many people wonder where the arrow of the filter should point towards.

Furnace filter air flow resistance.

Ever wonder which way the arrow should point on your furnace air filter find out right here. The problem is they don t filter that much. Minimum efficiency during the life of the filter is the most meaningful characteristic for most filters and applications. The common problem that virtually all modern furnaces have is that they make the furnaces so small that they can not fit a proper size filter in the furnace itself.

To build some good comparative data we tested 20 different air filters of various types thicknesses and efficiencies. Because the filter works to trap air particles for both your furnace and air conditioning system a clog during the hot summer months can cause the evaporator coil to freeze. The arrow should always point in the direction the air is flowing. Resistance refers to the static pressure drop across the filter at a given face velocity.

As a result the air conditioner cannot remove heat which leads to hot air blowing inside the house. Here s an easy way to figure out which way the air flow arrow goes. It holds 24 x24 filters with a depth of up to 20. When these filters get dirty and need to be changed air will still be able to flow through them and not clog as easily.

The jist of the myth is that these filters are the only ones that have a low enough resistance to allow sufficient airflow for the system to operate adequately. 4 inch vs 1 inch furnace filters the 4 inch thick air filter has a definite advantage over the 1 filter in terms of longevity airflow and maximum filtering potential. Our test duct is 8 feet long two feet wide and two feet high. Efficiency measures the ability of the filter to remove particles from the air stream.

A higher merv rating means the filter is more restrictive. They are designed to have very little resistance and can fit in the bottom of the furnace. Some technicians are anticipating that people will forget to change out their filters and using low efficiency filters regularly could help minimize damage to a neglected hvac. Filters of this category are recommended to be changed every two to four weeks which can be.

The arrow should always point towards the return. Remember any heating or cooling system that uses a fan to distr. In that case there s a lack of airflow moving over the coil making it impossible for the condensation to dissipate. Thus if it fits your furnace then a 4 inch air filter is better than a 1 inch air filter in regards to improving air quality.

A 3 ton air conditioner for instance requires 1200 cubic feet of air per minute to operate.