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REHVA: Indoor Air Quality and Thermal Environment in Classrooms with Different Ventilation Systems

This article presents the measurements of indoor climate in classrooms in the same school in Denmark. The classrooms had different ventilation systems: Ventilation was achieved either by manually operable windows, or by automatically operable windows with and without an exhaust fan in operation, or by a balanced mechanical ventilation system. Indoor air temperature and carbon dioxide (CO2) concentration, as well as opening of windows were continuously monitored for one month in the non-heating and heating seasons; measured CO2 concentration was used to estimate average classroom ventilation rates. The results show that mechanical ventilation and natural ventilation with automatically operable windows with exhaust fan performed notably better than the other systems. They indicate also that opening of windows was largely affected by customs and habits. Present results can be used as the basis for rational selection of systems that ensure adequate classroom ventilation.

Archived Briefings from Protect Our Province BC

Title image for briefing April 20 - COVID in the House: Protect Your Loved Ones
Wednesday, April 27th from 12:00-1:00 PDT What should you do if someone in your house tests positive for COVID-19? How do we prevent it from passing to loved ones in the household? Why should we care? Data is emerging that, due to variant mutations, COVID-19 reinfections are happening, even in highly-vaccinated countries. For that reason,… Continue reading COVID-19 in the House: How to Protect Your Loved Ones
Title image for Briefing 14 April 7, 2022 - COVID Doesn't Take Breaks, Neither Can We
Thursday, April 7 at 12:00 noon PDT Ignoring the 6th wave won’t stop it. What does the evidence say? Join Dr. Lyne Filiatrault, Dr. Brenda Hardie, and Gosia Gasperowicz, PhD, as they discuss what BC needs to do to lower community transmission as the most infectious strain of COVID ever becomes dominant across the globe.… Continue reading COVID-19 Doesn’t Take Breaks. Neither Can We.
Title image for Briefing 13: Ethics in Canada, March 23, 2022
Wednesday, March 23rd, 12:30-1:30 pm PT Join Canadian researcher and author Jon Parsons in a discussion with Protect our Province BC member Dr. Amy Tan about how Canada’s response to the COVID-19 pandemic amounts to a failure of ethical action.  The pandemic has brought issues with Canada’s governing systems and cultural identity into full view:… Continue reading Lack of Ethics: How Canada is Failing with COVID-19

More News from Protect Our Province BC

Post title - reinstate masks in public spaces
Protect Our Province BC, Safe Schools Coalition BC and BC School COVID Tracker are coming together to ask for mask protection in indoor public spaces, businesses, schools and on public transit in BC. The removal of BC’s mandated health protections has us concerned for the health and well-being of all British Columbians. “Now that masking… Continue reading Protect Our Province BC, Safe Schools Coalition BC and BC School COVID Tracker Issue Joint Press Release
translink masking open meeting title image
On March 11th, the British Columbia Public Health Officer, Dr. Bonnie Henry lifted the indoor mask mandate for most public places, with the main exception being healthcare settings.  TransLink immediately followed suit and lifted its own mask requirement, leaving commuters on  buses and trains with very few COVID-19 precautions. Unlike BC, Ontario and Quebec have… Continue reading Transit Users Ask Translink to Keep Mask Protections in Place.
Title image for blog April 2 - N95 masks and transmission
Share this: April 2, 2022  A Guest Post by Tim Henthorne, B.A.Sc., P. Eng Over the past two years, we have been flooded with opinions regarding the wearing of masks, all while trying to learn how to deal with the existential threat of COVID-19. Unfortunately, much confusion has come from Public Health itself with its… Continue reading N95 Masks & the Transmission of COVID-19