As scientists learn more about the COVID-19 virus, opinions are changing on how it is spread from person to person, and that has implications for how to reopen buildings safely.
Emphasis to date on protocols for reopening buildings has focused on surface cleaning and occupant density. But, if as some scientists suspect, the virus can live for at least three hours in aerosols—tiny particles that can be carried through the air for long distances—HVAC systems could play a key role in spreading the virus. There are opposing views on whether aerosols actually can transmit the virus, but if they do, then ventilation systems could spread the virus through unfiltered re-circulation of indoor air.
In April, ASHRAE addressed the issue of possible aerosol transmission with recommendations that include:
· Maintain a relative humidity of 40% to 60% inside buildings instead of the usual 20% to 40%.
· Install air filters rated at least at MERV-13.
· Minimize re-circulation of indoor air, and bring in outside air either by mechanical means or by opening windows.
The humidity recommendation was made because higher humidity makes aerosols heavier, causing them to drop to the floor faster. ASHRAE has also recommended that the intake of outside air be set to the highest level permitted by the mechanical equipment. Some specialists recommend a full re-commissioning process for reopening buildings.
Related Stories
| Mar 19, 2013
Senate bill would reform EPA’s lead renovation, repair, and painting rules
A bill to reform the EPA’s Lead Renovation, Repair, and Painting Rule (LRRP) was recently introduced in the U.S. Senate.
| Mar 19, 2013
Boston mayor’s energy efficiency disclosure rule under fire
A proposed ordinance in Boston mandating energy audits is coming under criticism from the Greater Boston Real Estate Board and others as being too costly and intrusive.
| Mar 18, 2013
USGBC to GAO: 'Schools need over $271 billion in maintenance fixes'
The Center for Green Schools at the U.S. Green Building Council (USGBC) has released its first “State of our Schools” report, highlighting the critical need to modernize school facilities to meet current health, safety and educational standards.
| Mar 14, 2013
Survey: Market demand now key driver for green construction
Construction firms across the world expect 60% of their projects to be environmentally friendly by 2015, according to the SmartMarket Report of McGraw-Hill Construction.
| Mar 14, 2013
Possible tax code changes prompt action from various industries, including construction
With Congress potentially tackling tax reform, businesses, trade groups and others are jockeying to get their voices heard.
| Mar 14, 2013
Concrete Polishing Association of America releases new standards
The Concrete Polishing Association of America(CPAA) Standards Committee, which reflects a cross-section of the concrete polishing industry, has created terminology to define the products and processes used to produce insitu polished concrete.
| Mar 14, 2013
World Green Building Council: Green buildings help mitigate real estate risk
Green buildings can offer benefits to a wide array of stakeholders throughout their life cycle, according to a report released by the World Green Building Council.
| Mar 14, 2013
Sustainability index aims to evaluate REITs on the greenness of their properties
FTSE Group, the National Association of Real Estate Investment Trusts, and the U.S. Green Building Council are working on a sustainability index that measures the portfolios of real estate investment trusts to provide transparency about LEED certification and Energy Star ratings.
| Mar 6, 2013
OSHA: Employers must post injury and illness summaries
The Occupational Safety and Health Administration is reminding employers to post OSHA Form 300A, which lists a summary of the total number of job-related injuries and illnesses that occurred during 2012.
| Mar 6, 2013
Study provides guidance to states on linking utility efficiency programs with energy codes
As states increasingly look to utilities to play an active role in supporting building energy codes, a new report from a coalition of energy efficiency advocates, has been issued to provide guidance for how state regulatory commissions and energy offices can best develop and evaluate such efforts.
