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
Codes and Standards | Apr 22, 2015
New York State renews design-build authority
Five state agencies are allowed to use design-build on certain projects.
Codes and Standards | Apr 22, 2015
OSHA’s estimated cost of silica rule said to underestimate impact by $4.5 billion annually
The coalition says that OSHA’s flawed cost estimates point to flaws in the rule, and has urged the federal agency to reconsider its approach.
Codes and Standards | Apr 22, 2015
2016 Seismic Provisions for Structural Steel Buildings draft available for public review
The comment period is open until May 29.
Codes and Standards | Apr 22, 2015
GBCI renamed Green Business Certification Inc.
The name change reflects the organization’s expanded certification and credentialing services.
Multifamily Housing | Apr 16, 2015
Seattle’s size restriction on micro apartments blamed for rise in rents
Seattle’s city planner recently said that the council’s new rules have made small apartments more expensive to build and charged the board with “overreaching” and not giving micro-housing “a fair shake.”
Green | Apr 16, 2015
New version of Building Energy Data Exchange Specification launched
BEDES is a dictionary that facilitates consistent exchange of building characteristics and energy use data between tools and databases in the building energy efficiency sector.
Codes and Standards | Apr 16, 2015
New York tops U.S. cities in walkability
Revitalization pushes Detroit and New Orleans up the rankings
Green | Apr 14, 2015
USGBC will recognize energy and water standards for the Living Building Challenge
This move means that projects achieving the energy and water requirements in Living Building Challenge will be considered as technically equivalent to LEED.
Codes and Standards | Apr 14, 2015
New York City preparing new codes for evacuation elevators
New York City’s Fire, Buildings, and City Planning Departments in New York are writing rules to govern occupant-evacuation elevators, reflecting a change in philosophy of how to evacuate people from skyscrapers in an emergency.
Codes and Standards | Apr 12, 2015
California imposes stringent new water standards
California is the first state to adopt standards that are more efficient than those set by EPA's WaterSense program.