Student Union Duct Cleaning Case Study

Duct Cleaning

Snyder Environmental provided dual duct system cleaning, air monitoring, and indoor air quality consulting in a sensitive area of an educational facility.

Air monitoring and sampling throughout the duct cleaning process, particularly in sensitive areas, ensures our clients maintain good indoor air quality during duct cleaning operations.

About the Student Union Duct Cleaning

Snyder Environmental was selected to evaluate an older variable air volume (VAV) heating ventilation air-conditioning (HVAC) system in a sensitive area of an educational facility. Based on building-specific air and swab samples, a sampling plan was created by Snyder to give the client the best information and representation of air quality for the HVAC system and ambient air spaces.

To properly clean the VAV duct system and air handling unit (AHU) and to remediate and clean the entire internal duct work system, the AHU was shut down and prepped for entry. Using proper respiratory protection and policies, including confined space awareness, Snyder safely entered the elevated duct work system in strategic locations throughout the project area.

Snyder utilized a combination of cleaning methods to accommodate the many different sizes and configurations of duct work such as manual entry and cleaning, mechanical entry and cleaning, high-efficiency particulate air (HEPA) vacuums, and chemical (EPA disinfectant) cleaning. As duct-system cleaning was being conducted in various areas of the facility, Snyder Environmental conducted daily air monitoring to ensure the indoor air quality was not being impacted by cleaning operations.

Snyder professionally resealed all entry points into the duct system after internal cleaning operations had commenced. The inside of the AHU was cleaned using proper disinfecting, coil degreaser, and filter changes. Snyder placed filter media in diffusers until final air sampling showed the duct system cleaning was complete in this highly sensitive area. While operating on a restricted time frame, Snyder cleaned the dual-duct VAV system and continuously monitored the indoor air quality throughout the process.

Case Details


Asbestos Abatement



Year Remediated


Services Used

Duct Cleaning

Air ducts are conduits used in heating, ventilation, and air conditioning (HVAC) systems to deliver or remove heated or cooled air to different rooms. If the air ducts are clean and work correctly, the air they circulate in the building will be safe and healthy. However, if they are clogged and dirty, they could pass toxins and other bio-hazardous elements through the property. When air ducts are clogged, they cause HVAC systems to work harder, which could make them shut down after a very short period. It’s important to have air ducts cleaned regularly and properly to increase the efficiency of an HVAC system, save money, and protect the health of occupants in the building.

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