Air Ionization Technology

Making buildings work better during a pandemic!

Casto Technical Services specializes in Air Ionization Technology.

This form of technology is especially important during a global pandemic, and our customers are taking advantage of it!

The Problem:

Many people are using aerosols as a mode of preventing the spread of germs. However, viral particles can remain suspended in the air for long periods of time and can be inhaled.

It is critical to have disinfected air to prevent the spread of COVID-19.

The Solution:

Air ionization has been proven to reduce Coronavirus Surrogate by 99% airborne and 80% on surfaces within 10 minutes. Air ionization technology is highly efficient, cost-effective, and easy to install.

Why Air Ionization:

  • Can be mounted in any HVAC system regardless of the size or type.
  • Simply wipe the ionization brushes whenever the HVAC air filter is changed.
  • The ion blocks DO NOT emit ozone.

How it Works:

Ion blocks are mounted in the central air conditioning system of any building. As the air passes over the ion blocks, millions of positively and negatively charged ions are formed. These bipolar ions disperse into the occupied space through the duct system, proactively attacking airborne contaminants where they cause the most problems for occupants.

Air Ionization Technology - How it Works - Casto Technical Services
Air Ionization Technology - How it Works - Casto Technical Services
Air Ionization Technology - How it Works - Casto Technical Services
Air Ionization Technology - How it Works - Casto Technical Services


Air ionization is highly effective on pollutants, such as particulate matter, bacteria, viruses, mold spores, odors, and Volatile Organic Compounds (VOCs).

About the Technology:

Air ionization, also called “negative ionization”, “bipolar ionization”, and “needlepoint ionization” is not a new technology. It first arrived in the US in the 1970s as a tool to control the pathogens in food manufacturing. This technology is used in thousands of commercial, institutional, residential, and industrial buildings throughout the world.

  • Hospitals, including John Hopkins, Boston Children’s Hospital, and University of Maryland Medical Center.
  • Terminals at La Guardia Airport, O’Hare International Airport, Los Angeles International Airport, and San Francisco International Airport.
  • TWA Hotel at New York’s JFK Airport
  • Large corporations, such as Google’s headquarters in Chicago and San Jose.
Air Ionization Technology - Pathogen Report - Combat COVID 19

Air Ionization Frequently Asked Questions:

Q. Is there an ozone byproduct from these ion blocks?

A. No, the Ion Blocks do not emit ozone into your ventilation system. The ion field created by the ion block, when placed in the return airstream, binds additional particle weight to the pathogen. Along with a proper sequence of operations and paired with all HVAC systems, VAV, CV RTU, dual duct mini splits, and unit ventilators the ion block is the lowest cost of entry towards mitigating the spread of COVID-19 inside of buildings.

Q. What is the sequence of operations?

A. The Ion Blocks are a plug & play solution that only requires 24VAC to run. There are no moving parts, and the ion block has a warranty of two years. The requirement for proper ionization is one ion block per 1,000 CFM of airflow or one unit per return duct in a room. The ion block can be set up stand-alone, or it can be networked into all DDC systems with a go/no go current transducer.

Q. We have a Building Automation System. Can these units be put into my system with graphics and visibility?

A. Yes, ion blocks can be wired to a digital output on any manufacturer’s controller. If an additional digital output is not available any 24V power supply can be used to run the ion block on a switch or 24/7/365 operation. By adding a simple go/no go current transducer, visibility can be generated to the front end by your preferred control technician.

The ion block is completely brand agnostic when it comes to tying into any BMS system, including Honeywell, Siemens, Johnson Controls, Distech, Automated Logic. Also, legacy systems and stand-alone programmable thermostats can provide the necessary power to run the ion blocks.