Arm Your Building Against Airborne Illness

In the face of the COVID-19 pandemic, strategies to protect occupant health and reduce the spread of disease are at the forefront of building design. Improving Indoor Air Quality (IAQ) is more important than ever as it impacts the health, well-being, and productivity of building occupants. Implementing robust IAQ strategies can mitigate the spread of disease and the health risks posed by an aging or poorly designed HVAC system.


HVAC Bipolar Ionization
HVAC Ultraviolet Lights
HVAC Humidity Control
HVAC Filtration


  • Jim Vizzini, in collaboration with Dr. Paul K. Carlton, Jr. and his medical network, is working to educate governing bodies (CDC, ASHRAE) on more effective air treatment systems to combat the spread of COVID-19.
  • Dr. Carlton, the 17th Surgeon General of the US Air Force, is a strong proponent of better air treatment. CJL continues to incorporate key pieces of Dr. Carlton’s strategies (UV-C irradiation and HEPA filtration) in prominent high-rise office buildings and hospitals.

COVID-19 Impact on HVAC

Strategies to protect occupant health and reduce the spread of disease have come to the forefront of building design. Indoor Air Quality (IAQ) is more important than ever.

Short Term Strategies

  • Maximize outdoor air 24/7 if possible while maintaining temperature and proper humidity levels
  • Disable demand-controlled ventilation sequences
  • Ventilate during unoccupied hours
  • Verify filtration
  • Ensure facility staff wear personal protection equipment when maintaining HVAC air handling equipment

Our Fast Track Team Provides a Rapid Response to Infrastructure Challenges

  • Expedited Professional Services
  • Retro-Commissioning
  • BAS Analysis
  • Improved Controls Performance
  • Emergency HVAC
  • Electrical and Plumbing Design Services
  • Contractor Assistance

HVAC Bipolar Ionization

  • Deploys negative and positive ions into the airstream, exchanging electrons with particles
  • Charges ions in the space to cause agglomeration of particles, allowing capture in the filter
  • Neutralizes particulate matter, aerosols, bacteria, viruses, and VOCs in airstream, destroying pathogens at the cellular level
  • Lowers electricity draw and lowers maintenance
  • Installs easily in air handling units
  • Mounts upstream of coil and any humidification device, avoiding exposure to moisture

HVAC Ultraviolet Lights

  • Eliminates viruses, fungi, bacteria, pathogens on surfaces through germicidal irradiation
  • Properly dosed UV-C lights are extremely effective
  • Verified 99% kill rate on earlier COVID strains (SARS, swine flu) and three times easier to eliminate with UV-C than common cold virus
  • Installs in air handling units or localized applications
  • Recommended by ASHRAE and CDC
  • Bulbs must be replaced annually

HVAC Humidity Control

  • Humidity control is the first step to healthy IAQ
  • Indoor relative humidity (RH) levels should be maintained at 40%-50% for optimum human health
  • At RH levels <40%, aerosols are smaller, move about easier, and get deeper into the lungs
  • Human first response immune defense is impaired below 20% RH
  • Consistently high RH can lead to mold growth

HVAC Filtration

  • Code minimum filter efficiency (MERV 8) is only effective at trapping larger particles, including hair, carpet fiber, pollen, mold spores, and dust mites
  • Increased HVAC filter efficiency (MERV 13) greatly improves IAQ by capturing smoke, fine dust, bacteria, and aerosols (virus carriers)
  • HEPA filters trap viruses and particles <0.3pm
  • Install in air handling units or local air recirculating equipment

CJL Engineering Adds Air Ionization Units at Johnstown Office to Mitigate Airborne Pathogens

For Immediate Release: CJL Engineering (, a multi-disciplinary mechanical, electrical and plumbing engineering consulting firm recently installed three Air Ionization Units into the HVAC System at its Johnstown location.

“As Consulting Engineers who design building systems, good air quality is always part of our mindset; the Covid-19 surge has brought it into a sharper focus,” said Jim Vizzini, CJL Managing Partner.

“In the face of this pandemic, strategies to protect occupant health and reduce the spread of disease have come to the forefront of building design. Indoor Air Quality (IAQ) is more important than ever, impacting the health, comfort, well- being and productivity of building occupants,” Vizzini said.

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