Experts examined reduced pathogen transmission using a building’s original mechanical design, original installation, design intent, and proper maintenance in a new white paper.
Return Ductwork Requirement for Airborne Pathogens Through the Airstream, discusses two approaches: pressure barriers and airflow distribution. The paper looks at the pros and cons of using the cavity above a finished ceiling as a return air plenum combined with supply air to the air handler as a proper ventilation technique.
Considerations include how ventilation systems affect the health and well-being of building occupants. A ceiling plenum provides some fan-specific energy efficiency and reduced material and labor costs, but it could put occupants and workers at risk and result in unintended energy losses. An open ceiling plenum is difficult to clean and disinfect, while ductwork can be easily cleaned.
A ducted return system allows a testing, adjusting, and balancing professional to adjust room pressures and airflow patterns to accommodate a change in use or mitigate pathogen transmission during a pandemic. Authors of the white paper include members of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Technical Committee 5.2 Duct Design.
Related Stories
| Nov 20, 2013
How LEED and Green Globes stack up
An analysis of the strengths and weaknesses of the Green Globes rating system and LEED standards puts LEED ahead, but doesn’t discount the merits of Green Globes.
| Nov 14, 2013
First LEED v4 certified project garnered by Beijing furniture showroom
Haworth’s showroom in Beijing’s Parkview Green building has been recognized as the world’s first certified LEED project under the USGBC’s new LEED version 4 beta program.
| Nov 14, 2013
OSHA proposes requirement for large firms to disclose workplace injuries
A proposal from the Occupational Safety and Health Administration would require companies with more than 250 employees to disclose workplace injury and illness reports online.
| Nov 14, 2013
GSA asks for input to help study energy-efficient technologies on its buildings
The General Services Administration has posted a request online, asking those in industry, academia and nonprofits for information on green building technologies.
| Nov 14, 2013
Document on gypsum boards sets stage for preparing Environmental Product Declaration
The Gypsum Association has completed the development of a product category rules (PCR) document for North American gypsum boards.
| Nov 14, 2013
ISO, FLASH team up to promote stronger building codes
ISO has joined the national nonprofit Federal Alliance for Safe Homes (FLASH) to encourage communities to build disaster-resistant buildings that can withstand hurricanes, tornadoes, earthquakes, and other catastrophic events.
| Nov 6, 2013
Cost to small businesses from silica rule is raised by progressive group
The silica-dust rule from the Occupational Safety and Health Administration could put small businesses at a disadvantage on the cost of complying with the mandate, according to the Center for Progressive Reform.
| Nov 6, 2013
Uneven snow load concern prompts structural study of Minnesota college auditorium roof
The roof of the Memorial Auditorium of Concordia College in Minnesota will undergo a complete structural analysis because it was built to 1946 codes and may not be able to accommodate uneven snow loads.
| Nov 6, 2013
Dallas’s goal of carbon neutrality by 2030 advances with second phase of green codes
Dallas stands out as one of the few large cities that is enforcing a green building code, with the city aiming to be carbon neutral by 2030.
| Nov 6, 2013
Task force to examine resiliency in the face of climate change
President Barack Obama recently signed an executive order related to climate change and disaster-management efforts during severe weather events and other disasters.