By Molly Cox
The Residential Green Building Committee gathered on October 16th, 2017. We had a guest presentation from John Rockwell, of Zehnder America. He was here to help us understand proper and efficient mechanical ventilation standards for buildings.
He started off by emphasizing the importance of making buildings airtight, and not just jumping straight to insulation measures when looking for fixes. He continued to explain that air movement is the primary goal, because of all the contaminants and toxins buildings can have inside (in the rugs, furniture, etc), and we need that to move through.
John went on to explore the different ventilation options: Exhaust Ventilation, Supply Ventilation, Balanced Ventilation and Heat Recovery Ventilation. The conclusion was that the Balanced Ventilation is highly recommended in conjunction with an HRV or ERV, over Supply Ventilation for example, which pulls outside air into the home, while the stale air exits the home through building envelope leakage. The HRV serves as a heat exchanger between the fresh and stale air, and they actually have a higher heat recovery efficiency than an ERV. The reason being is because the HRV isn’t focused on moisture transfer like the ERV’s are, so there are more resources being dedicated to the heat exchange.
John explained that when choosing to implement an HRV or ERV, it is important to think about climate, occupancy, and humidity levels. Not only are all these ventilation methods supposed to be efficient for overall energy use, but they are also supposed to enhance the health and comfort of the inhabitants within the building.
John taught us a lot on Monday night, and was an extraordinary teacher for all of us! We hope you will join us at our next Residential Green Building Committee meeting to continue the conversation and learn from one another.
Here are some upcoming events to keep an eye on:
October Greenbuild Mixer with BCBS of Massachusetts Oct 26th, Boston
How to Network at Greenbuild and Build Your Career in Sustainability Oct 26th, Boston
Global Head of Sustainability, Superior Essex
Sustainability Director, Steven Winter Associates
PE | Associate, LeMessurier
Vice President, AEW’s Architecture & Engineering group
Interior Designer, Jacobs, Boston
Senior Vice President, Market Transformation and Development U.S. Green Building Council
AIA LEED AP BD+C | Senior Associate, Gensler Boston 
LEED Fellow, WELL AP | Founder and Principal, Ecoworks Studio
AIA, LEED AP BD+C, WELL AP
LEED AP BD+C | Environmental Sustainability Manager, Armstrong World Industries
Assistant Professor of Exposure Science | Director of the Healthy Buildings program
Managing Director, Harvard University Office for Sustainability
Principal & Director of Certifications and Consulting, Epsten Group, Inc.
Vice President of Sustainability and Corporate Social Responsibility, Jamestown
Director of Sustainability Programs, DASNY | LEED AP BD+C
Associate Principal, BuroHappold Engineering
Senior Vice President, Sustainability at Kilroy Realty Corporation
Co-Founder, Facilitator at The Laurentia Project | LEED AP BD+C, LFA
Vice President of Sustainable Development, Shaw
Founder and President, Board of the Healthy Building Network
Building Technology Director, Kingspan North America
LEED® AP ID+C, BD+C, USGBC Faculty, WELL® AP, WELL Faculty and Fitwel Ambassador
Workplace Strategy Expert and Researcher, EYP
Principal, Integrated Ecostrategy
Senior Vice President, International WELL Building Institute
Principal, Bruner/Cott
Architect, Associate, and Sustainability Design Leader, Stantec Architecture and Engineering
FAIA, LEED Fellow, Long Green Specs
Products & Materials Specialist, BuildingGreen
Director of Acquisitions and Development
Director of Restorative Enterprise, Interface
Sustainability Manager, Consigli Construction Company