Air filtration and indoor air quality (IAQ) have been provided the necessary components of a healthy and efficient air conditioning systems. Keeping both issues in the focus tends to be a full time job in a large institution. Add a third component – the use of energy, which requires careful planning and integration with preventive maintenance (PM) of the program – and the mixture of air system energy use due to air filter with load replacement filter time can be a difficult task.

Proper filter selection and replacement, uniform airflow and speed, and reasonable air, pressure drops will lead to greater energy use constant. Match the filter in demand, occupancy and code requirements also helps in the correlation filter installation to use energy.
Filter characteristics

Three characteristics proper filter selection and performance are efficiency, resistance to air flow and dust holding capacity.

The efficiency measures the ability of the filter to remove particulates from the airstream. Minimum efficiency over the life of the filter is the most significant characteristic for most filters and applications.

Resistance refers to the static pressure drop across the filter to a given flow rate. The dust holding capacity defines the amount of dust a filter can hold air when operating at a flow rate of air to a maximum resistance value determined.

Evaluation of filter types requires data on the efficiency, resistance during filter loading and dust retention capacity in different pressure drops. These factors can directly affect the ability of the fan to move air variable resistors, which can lead to increased fan power requirements and improved brake energy use. Studies have shown that re-circulate the air tends to have a higher proportion of fiber that has the outside air, but the proper filtration can reduce dust and lint in space, resulting in lower maintenance costs.