Turner's Caulfield Talks COVID and Clean Air with the Granite Geek

H.L. Turner Group affiliate Turner Building Science & Design's (TBS) Steve Caulfield, PE, spoke with the Concord Monitor's Granite Geek David Brooks, to explore approaches to protect against COVID.

With a growing need to improve indoor air quality for businesses across the nation due to the COVID-19 virus, Caulfield, a Certified Industrial Hygienist with over 30 years of experience, and the other mechanical engineers at TBS have been busy performing building evaluations and developing solutions to provide safer and cleaner indoor spaces.

“We’re seeing a lot of people trying to increase the amount of air replacement, the air change rate. The problem we run up against is the engineering problem that on a hot day your system is only designed to cool so much outside air. Beyond that you either raise the temperature or humidity in the space, or both,” Caulfield said. “You can’t just go to every building and open every outside air damper.”

As David Brooks explains, this same complication comes up with air filters. Air filters are calibrated on the MERV (Minimum Efficiency Reporting Value) scale, with bigger numbers removing smaller-sized particles.  Most buildings have filters that are rated as MERV 8, but as Caulfield points out, “it’s not until you get to about a MERV 13 that you start removing 90% or more of virus-sized particles.”

Unfortunately, a MERV 13 filter generally won’t fit into the designated filter space, and the tighter filter puts an additional burden on motors.  As Brooks points out, the added work could burn out motors and will certainly reduce airflow, allowing viruses to build up – the exact opposite of what you want.

For over 30 years, the professionals at TBS have been working to understand the complicated yet delicate nature of balancing HVAC design and system controls to optimize indoor air quality.  To find out how to improve the air quality in your building, contact our experts.  

To read the entire interview, click:

Turner Welcome's Grace Johnson and Allison Wilber

The Turner Group is happy to welcome our two new interns, Grace Johnson and Allison Wilber.

Grace Johnson, University of Maine 2022, joins the firm as an intern in our Civil Engineering division.  Grace, a native of Bedford, NH, will be working with our seasoned engineers on various projects such as hydropower dams, school athletic fields, and municipal buildings.  Grace is an active member of UMaine Orono’s Engineers without Borders.

Allison Wilber, Roger Williams University 2020, will be our Graphics and Communications intern.  Allison, a native of Bow, NH, is working with our marketing and business development staff to assist in graphic development and messaging.  Allison rode for the RWU Equestrian Team and helped the team win the Zone Championship in 2019. 


Turner's Tom Betteridge Talks Indoor Air Quality for PlanNH

Business owners, building owners, municipalities and others are grappling with how to keep those who enter their indoor spaces safe.  What measures can be implemented to reduce the risk of virus and other particulates of spreading throughout our buildings?  Where do they come from? Is there a best way to capture, eliminate or kill them?

This "Hawk Talk" (a short half-hour discussion) hosted by Plan NH, will look at measures that can be implemented to minimize risk.

Tom Betteridge,  PE, VP of Mechanical Engineering at the H.L. Turner Group, will address the above questions and talk about the role of Indoor Air Quality and Building Systems.  While there is no "silver bullet", there are items and ideas which we should all be considering to reduce our exposure to pathogens and increase our vitality.

This discussion is geared towards architects, engineers, municipal staff and others who are part of the future state of our buildings and lives.

Register here:  


To learn more about our IAQ services, click here.


A Message from Turner Staff Regarding COVID-19

Dear Clients, Business Partners & Colleagues:

In response to the current coronavirus health crisis, The Turner Group is taking every precaution to maintain the safety of our staff and communities by eliminating non-essential travel and in-person meetings.  We are following a rigorous hygiene policy that is aligned with the Centers for Disease Control and Prevention guidance and best practices and continue to monitor and adjust as appropriate.

Our firm is also taking advantage of the latest technology to allow our staff to work without interruption and provide project deliverables on schedule as best as reasonably possible.

We appreciate your continued open communication and please forward any concerns or suggestions that you may have in the coming weeks.  All of us at The Turner Group wish you and your loved ones a safe and successful transition toward a quick resolution to the COVID-19 pandemic.

The Turner Group Hosts NH Saves Lunch and Learn

The H.L. Turner Group Inc. hosted a lunch and learn for our employees and guests, presented by NH Saves.  Our staff understand that energy efficiency is a vital part of keeping New Hampshire's residents, businesses, and towns economically successful, now and in the future.  Having worked with NH Saves on projects such as the City-Wide Community Center, Concord, NH, our approach is to incorporate their experts early on in the project to ensure our clients receive the resources and rebates necessary to help save time, money, and energy. 

NHTI Students Visit Turner Group HQ

A group of students from New Hampshire Technical Institute (NHTI) made their annual trip to The Turner Group's headquarters in Concord, NH.   Bill Hickey, Senior Vice President at The H.L. Turner Group Inc., leads the tour of the facility, which he helped design.  Mr. Hickey received his degree from NHTI and continues to teach at the college.  

NH Historical Society and The H.L. Turner Group Receive Preservation Award

Concord, NH – On May 10, the N.H. Preservation Alliance announced eleven awards for outstanding historic preservation projects.  The New Hampshire Historical Society received one of these coveted awards for work completed on the building in collaboration with The H.L. Turner Group.

According to N.H. Historical Society President, William Dunlap, “The New Hampshire Historical Society chose H.L. Turner to help us develop and evaluate possible approaches to modernizing the climate control systems in our historic National Register-listed building.  In addition to mechanical systems, the project also involved reconstructing skylight systems covering 40% of our roof area, which were highly inefficient.  Following the preliminary planning process, H.L. Turner designed and engineered the ultimate systems to meet these challenges.

This was a complex project due to the historic nature of the building.  H.L. Turner handled the project with sensitivity, worked extremely well with other vendor team members, and delivered a design that worked flawlessly.”

The N.H. Preservation Alliance awards recognize individuals, organizations, and businesses in the categories of restoration and stewardship, rehabilitation, compatible new construction, public policy, and educational and planning initiatives across the state.

Turner Group Receives Merit Award for Community Center

The Turner Group was recognized with a Merit Award from Plan NH for our work on the Concord City-Wide Community Center, Concord, NH.  This project was built on the site of the former Dame School, parts of which were repurposed for the facility. 

The project was selected by a field of nominations by a jury of professionals in the planning, design, and development industries.  This award honors building projects that embody smart growth principles, social responsibility, and outstanding cooperation or collaboration.   

Turner Group Receives Award for the Merrimack Lodge, NH

The architects and engineers of The H.L. Turner Group Inc. were recognized with a Merit Award for the Merrimack Lodge at White Park in Concord, NH at the 2019 Excellence in Construction Awards, hosted by the Associated Builders and Contractors of NH/VT. We would like to extend a special thank you to the City of Concord New Hampshirefor allowing us to apply our talents to beautify a portion of White Park with the new skate house.

For more information about the lodge, including how to rent the lodge for your next event, visit:

The H.L. Turner Group Adds Project Architect

The H.L. Turner Group Inc., an award-winning architectural and engineering firm headquartered in Concord, NH, announces that Daniel Hall, AIA, has joined their team.  Mr. Hall has over 12 years of experience working with commercial, office, residential, and mixed-use projects.  His past projects have given him the opportunity to be involved in every aspect of the architectural process, from schematic design, development, construction contracts, construction coordination, producing framing layout and sizing, and client communications.

Turner Group President and CEO, Harold Turner, Jr. PE, believes Mr. Hall is an impressive addition to the firm saying, “Dan’s experience and educational background have given him a strong technical skillset, strong work ethic, and keen attention to detail.   Having Dan on our team makes The H.L. Turner Group even stronger as we guide architectural and engineering projects from conception to completion.”


Turner Group President/CEO named Business Leader of the Year

Turner Group President/CEO Harold Turner was named the 2019 Business Leader of the Year by Business NH Magazine.  Turner was awarded the title based on his leadership in NH's engineering industry and his duel passions for sustainable energy projects and school choice.  Harold Turner is the founder, president and CEO of The H.L. Turner Group in Concord, NH, an architectural and engineering firm with more than 30 employees.  

 Turner spent his early years advocating for sustainability energy practices including small-scale hydropower development, net-zero, and 'whole building' concepts and designs.  Throughout his career Harold always prioritized giving back, serving on nonprofit boards including the Business and Industry Association of NH, Associated Builders and Contractors of NH/VT, and the Granite Institute.  He also sits on the board of Granite State Hydropower Association and is an advisory member of the NH Technical Institute, NH Clean Tech Council, and NH Children's Scholarship Fund.  

Plan NH Hosts Event at Turner Group Office

Plan NH, a nonprofit organization dedicated to fostering excellence in planning, design, and development of NH's built environment, held an after-hours event at H.L. Turner Group's headquarter in Concord, NH.  The event, which was co-hosted by Milestone Engineering and Construction, Inc., included networking and a presentation by Turner Group's Jon Lavigne.  The presentation discussed the issues of building in New Hampshire floodplains, including the different types of floodproofing methods, example projects, and a discussion on innovative partnerships that have resulted in a resilient built environment.  

Turner Group Completes Hampton Academy Renovation & Addition

H.L. Turner staff attended the Hampton Academy ribbon-cutting and open house for the $25 million dollar renovation and addition project.  As principal designers, our architects and engineers worked with the staff and district, as well as partners from Bonnette, Page & Stone and Owner’s Project Manager Trident Project Management, to complete the project.  Hampton Academy was originally constructed in 1939 and renovations were last done about 45 years ago.  

The project was approved by the school district in 2017 and completed in phases.  Major project components include a new gymnasium, improved HVAC and security, updated science classrooms, and an auditorium that was previously the gymnasium, and community space.

Additional pictures and coverage are provided by "Seacoast Online":

Turner's Jon George Earns PE License

The H.L. Turner Group Inc. would like to congratulate Jonathan George for earning his Professional Engineer license in New Hampshire.  Over the past five years with our firm, Jon has gained valuable experience as a structural engineer through his involvement in a variety of projects ranging from building assessments to hydroelectric design. 

Some of his notable projects include the New Hampshire Army National Guard Readiness Center in Portsmouth, NH; Methuen Construction Headquarters in Plaistow, NH; Pennichuck Water Works Distribution Facility in Merrimack, NH; and work on various school buildings such as Hampton Academy and Auburn Village School.  Jon graduated from the University of New Hampshire in 2014 with a B.S. in Civil Engineering and from New Hampshire’s Technical Institute in 2012 with an A.S. in Architectural Engineering. 

Jon is actively involved in Associated Builders and Contractors (ABC).  He is a graduate of ABC’s Future Leaders in Construction program and teaches a Structural Principles course for their Project Superintendent Certification program.