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Formaldehyde in Focus: How New EPA Findings & ASHRAE’s Position Document on Indoor CO2 Reshape IAQ Priorities

February 25, 2025

Building Standards

Discussions about indoor air quality (IAQ) usually focus on particulate matter and carbon dioxide (CO2) with gases like formaldehyde and […]

In October 2024, ASHRAE published another addendum to Standard 62.1-2022, Ventilation and Acceptable Indoor Air Quality, to simplify the process to qualify gas-phase air cleaning technologies used with the IAQ Procedure or IAQP. This latest update, which is called Addendum g, “provides additional templates to document air cleaning systems used in compliance with the indoor air quality procedure in Section 6.3.” Addendum g is designed to encourage the use of the IAQP by making the procedure simpler and less risky for engineers to apply. Addendum g does this by providing templates in Informative Appendix I to document compliance of mechanical fibrous filters, sorbent filters, and other types of filtration and air cleaning systems used with the IAQP.

Latest Update to ASHRAE 62.1 Simplifies Process to Qualify Gas-Phase Air Cleaning Technologies

November 8, 2024

Building Standards

In October 2024, ASHRAE published another addendum to Standard 62.1-2022, Ventilation and Acceptable Indoor Air Quality, to simplify the process […]

Figure 1 - VRP and IAQP Outdoor Airflow

Updates to ASHRAE Standard 90.1 Make Unlocking Energy Savings using the IAQP Even Easier

September 3, 2024

Energy Efficiency

In this blog post, we examine a recent update to ASHRAE Standard 90.1-2022, the Energy Standard for Sites and Buildings […]

ASHRAE Standard 62.1 - 2022

Major Updates by ASHRAE Make the IAQP Simple to Use

July 9, 2024

Building Standards

Recent updates by ASHRAE elimate the potential increased risk of designing ventilation systems with gas-phase air cleaning technology. This has […]

Figure 2- DCAS in Optimized Case with (3) HLR Modules

How to Optimize DOAS/VRF Designs with Sorbent Ventilation Technology

May 22, 2024

HVAC Design

We dive deeper into how the IAQ Procedure in ASHRAE Standard 62.1 and sorbent air cleaning such as SVT can […]

K-12

Cost Implications of Different Ventilation Strategies to Simultaneously Achieve Energy, IAQ, and Resiliency Goals

February 29, 2024

Cost Savings

A peer-reviewed paper published in the ASHRAE Journal and authored by Dr. Marwa Zaatari and Joe Maser examines the cost […]

Ask the Experts: Dr. Bill Bahnfleth of Penn State and ASHRAE Fellow

Ask the Experts: Dr. Bill Bahnfleth, PSU Professor and ASHRAE Fellow

November 28, 2023

HVAC Design

In this installment of enVerid’s Ask the Experts blog series, enVerid CEO Christian Weeks catches up with Dr. Bill Bahnfleth, […]

Figure 2: Annual cost of commercial cooling ventilation air per ft2 with traditional vs. hybrid approach

In the face of rising cooling costs, ASHRAE’s IAQ Procedure and sorbent air cleaning offer relief

October 17, 2023

Cost Savings

The combined effect of rising temperatures and increasing electricity costs have resulted in a 29-72% increase in ventilation cooling costs […]

Figure 2 from ASHRAE Journal

Energy Smart Compliance with ASHRAE Standard 241 for Control of Infectious Aerosol

September 26, 2023

Energy Efficiency

In May of this year the Centers for Disease Control and Prevention (CDC) updated their ventilation guidance for pandemics. Then, […]

Healthy office photo by Alesia Kazantceva on Unsplash

New LEED Pilot Credit Offers 2-3 Points for Designing a More Efficient Ventilation System using ASHRAE’s IAQ Procedure

August 22, 2023

Building Standards

In July 2023 the USGBC published a new pilot alternative compliance path (ACP) that allows project teams to use the […]

enVerid HLR 100C

Light Commercial Buildings Can Save on HVAC and Energy Costs

June 26, 2023

HVAC Design

enVerid Systems is excited to announce the launch of the HLR 100C, a new sorbent filtration module that fits inside […]

Toronto's smoky skies. Photo by DESIGNECOLOGIST on Unsplash

Lessons from NASA and the Navy: How to design buildings to protect us from polluted outside air and emit less carbon

June 7, 2023

Air Quality

Building ventilation is the second largest energy use in commercial buildings in the U.S. because we replace all indoor air […]

ASHRAE standard 62.1-2022 Addendum n

ASHRAE Further Improves the IAQP with Addendum n

March 21, 2023

Building Standards

Despite many benefits, a challenge with the IAQP has been lax efficiency testing requirements for air cleaning technologies used with […]

enVerid Ask the Experts with Brandon Harwick, Engenium Group

Ask the Experts: Video Blog with Brandon Harwick of Engenium Group

February 27, 2023

HVAC Design

In this installment of enVerid’s Ask the Experts blog series, enVerid CEO Christian Weeks chats with Brandon Harwick, founder and […]

RMI UndauntedK12 Report HVAC Choices for Health and Learning

RMI and UndauntedK12 Report: HVAC Choices for Student Health and Learning

January 19, 2023

HVAC Design

A new report from RMI and UndauntedK12, HVAC Choices for Student Health and Learning: What Policymakers, School Leaders, and Advocates […]

enVerid Ask the Experts with Nathan Kegel, DLR Group

Ask the Experts: DLR Group’s Nathan Kegel, High Performance Design Leader

November 22, 2022

Energy Efficiency

Nathan Kegel is High Performance Design Leader at DLR Group. His team “Zero Heroes” won the “Lowdown Showdown” design challenge […]

The Clean First Framework for Sustainable IAQ: Step 1

Defining Indoor Air Quality: Which Metrics Matter Most

September 27, 2022

Air Quality

This is the first in a series of blog posts that discuss the 4-step Clean First framework described in the […]

Peak cooling load & ventilation energy savings with energy recovery & sorbent air cleaning

How to Electrify Buildings Using Sorbent Air Cleaning & Energy Recovery

August 30, 2022

HVAC Design

As more building codes adopt net zero energy as the target for new construction and existing building operations, energy efficient […]

enVerid Ask the Experts with Tim Dorman of Havtech

Ask the Experts: Tim Dorman of Havtech

July 13, 2022

HVAC Design

enVerid CEO Christian Weeks interviews Havtech’s Tim Dorman about trends in commercial building design and how they have changed as […]

Clean air and save in offices with enVerid HLR technology

EPA Draws Link Between Low-Dose Formaldehyde Exposure and Cancer

June 23, 2022

Air Quality

In April, the U.S. Environmental Protection Agency released an updated draft risk assessment for formaldehyde, the leading gaseous contaminant in […]

enVerid: A Breath of Clean (Not Fresh) Air

Clean Air Month – A Breath of Clean (Not Fresh) Air

May 24, 2022

Air Quality

As we conclude the American Lung Association’s Clean Air Month, I wanted to take a moment to revisit some of […]

enVerid Ask the Experts with Brett Bridgeland of RMI

Ask the Experts with RMI’s Brett Bridgeland: Resource Efficient Electrification

May 5, 2022

Building Standards

In this installment of Ask the Experts, enVerid CEO Christian Weeks catches up with Brett Bridgeland, Manager at RMI, an […]

Christian Weeks, CEO, enVerid Systems on Sustainable IAQ

Additional Action Needed to Achieve Clean Air & Decarbonization Goals in Commercial Buildings

April 27, 2022

Energy Efficiency

The EPA’s recently announced Clean Air in Buildings Challenge is a critical step to focus attention on the importance of […]

cove.tool's analysis.tool Compares Designs on EUI and LEED Points

enVerid and cove.tool Partner For Easy Modeling of ASHRAE’s IAQ Procedure and enVerid’s SVT

April 13, 2022

Air Quality

enVerid is excited to announce a new partnership with cove.tool to incorporate ASHRAE’s IAQ Procedure ventilation calculations and enVerid’s Sorbent […]

enVerid Ask the Experts with Cory Duggin of TLC Engineering

Ask the Experts with TLC Engineering Solutions’ Cory Duggin

March 9, 2022

HVAC Design

Cory Duggin speaks with enVerid CEO Christian Weeks about his design for the new University of Miami Centennial Village dorms, […]

ASHRAE Addendum aa

ASHRAE Makes Adopting the IAQ Procedure Easier with Addendum aa

February 16, 2022

Building Standards

Today, ASHRAE published Addendum aa to Standard 62.1-2019, Ventilation for Acceptable Indoor Air Quality. The publication of Addendum aa is […]

Clean First - The Sustainable IAQ Process

How to Achieve Sustainable Indoor Air Quality in the Age of COVID-19

January 26, 2022

HVAC Design

This blog describes a new Clean First framework to achieve Sustainable IAQ: better indoor air quality, more efficiently, with increased […]

enVerid Sorbent Filter

Sorbents for Indoor Air Cleaning: A Primer

December 21, 2021

HVAC Design

With both indoor air quality and carbon emissions reduction a growing priority for building owners, managers, and tenants alike, there […]

enVerid Ask the Experts with Anil Giri of GES, a Salas-O'Brien Company

Ask the Experts with Anil Giri of Global Engineering Solutions: Delivering Superior Indoor Air Quality Energy Efficiently

November 22, 2021

HVAC Design

The “Ask the Experts” series features conversations with mechanical engineers, architects, IAQ authorities and other built environment thought leaders about […]

ASHRAE 145.2 air cleaner testing standard

How Well Will Your Air Cleaning System Perform? Why You Need to Know About ASHRAE Standard 145.2

October 26, 2021

Building Standards

With the commercial building market focused on how to achieve good indoor air quality (IAQ) energy efficiently, a growing number […]

enVerid Ask The Expert: Drew Morrison of Slipstream

Ask the Experts with Drew Morrison of Slipstream

October 14, 2021

HVAC Design

enVerid CEO Christian Weeks catches up with Drew Morrison, energy engineer at Slipstream, in our latest “Ask the Experts” blog. […]

Wildfire Smoke by designecologist

ASHRAE Releases New Planning Framework for Protecting Commercial Building Occupants from Wildfire Smoke

August 30, 2021

Building Standards

As we saw earlier this summer, smoke from Western U.S. and Canadian wildfires impacted not just nearby states, but traveled […]

Southwest Florida Community Foundation Collaboratory LEED Gold

How to Integrate HVAC Load Reduction® with Packaged Rooftop Units (RTU), Air Handling Units (AHU) and Energy Recovery Ventilators (ERV)

August 25, 2021

HVAC Design

Recently, we wrote about how to integrate HVAC Load Reduction® (HLR) with Dedicated Outside Air Systems (DOAS), Energy Recovery Ventilation […]

enVerid HLR Install - Financial Services HQ NYC

How to Integrate HVAC Load Reduction® with Dedicated Outside Air Systems (DOAS), Energy Recovery Ventilation (ERV), and Variable Refrigerant Flow (VRF) Units

August 19, 2021

HVAC Design

The use of Dedicated Outside Air Systems (DOAS) and Energy Recovery Ventilation (ERV) is growing quickly, driven by the adoption […]

enVerid Ask the Experts CMTA

Ask the Experts with CMTA’s Ray Beaufait and Brice Watson: Delivering Superior IAQ with DOAS + HLR Air Scrubbers

August 2, 2021

HVAC Design

enVerid is debuting an “Ask the Expert” blog series featuring our CEO Christian Weeks’ conversations with design engineers, architects, IAQ […]

ASHRAE 62.1-2019 User's Manual

How to Use the IAQP: A Streamlined Approach Based on the New ASHRAE 62.1 User’s Manual and Addendum aa

July 28, 2021

Building Standards

This blog post has been updated to reflect a simplification to how the IAQP is applied based on Addendum aa […]

ASHRAE 62.1-2019 User's Manual

“Crucial” Indoor Air Quality Guide – New ASHRAE 62.1 User’s Manual Provides Guidance on When to Use the IAQP

July 15, 2021

Building Standards

In late June, ASHRAE published its revised Standard 62.1 User’s Manual, bringing it up to date with the ANSI/ASHRAE Standard […]

enVerid HEPA Air Purifier with Controller

Experts Embrace “Equivalent Air Changes” Approach to Reduce COVID Transmission in Buildings

April 26, 2021

Building Standards

In the early days of the COVID-19 pandemic, ASHRAE released initial recommendations based on our limited understanding of the virus […]

Target Air Changes for Schools

HEPA Filtration Units – Why It’s More Important Than Ever for Schools to Do Their Homework

March 29, 2021

HVAC Design

From Dr. Fauci to the CDC to ASHRAE, experts recommend employing HEPA filters as part of a layered approach to […]

enVerid-HLR-Product-Family

Introducing the HLR 100M: Smaller Footprint, Expanded Applications – Same Superior IAQ and HVAC Energy Savings

February 24, 2021

HVAC Design

Q: What do Microsoft’s greenest building in Israel (LEED V4 Gold), the University of Miami’s UHealth Fitness and Wellness Center, […]

ASHRAE Core Recommendations for COVID-19

ASHRAE’s HVAC Guidance for COVID-19 Mitigation Has Changed. Has Your Strategy Kept Up?

February 8, 2021

Building Standards

As we enter a new year and move forward with vaccines to address the SARS-CoV-2 pandemic, it’s a natural time […]

How to select an in-room HEPA air purifier

A Buyer’s Checklist for In-Room HEPA Air Cleaners

January 4, 2021

Air Quality

Experts recommend that enclosed gathering spaces at schools and businesses achieve at least 3-5 total air changes per hour (ACH). […]

The Times of Israel image: Microsoft's new campus in Herzliya, Israel, inaugurated in November 2020 (Amit Geron)

2020: Indoor Air Quality (IAQ) Becomes Priority #1 in Commercial Buildings

December 22, 2020

Air Quality

As we come to the close of this unprecedented year, we are reflecting on how Indoor Air Quality (IAQ), the […]

Indoor Air Quality (IAQ) in Offices

IAQ and COVID-19 Risk Mitigation in the Office Environment

December 16, 2020

Air Quality

After months working remotely, a recent survey of 2,300 U.S. workers revealed that more than 80 percent of the respondents […]

Air purification in offices

Choosing an In-room HEPA Air Cleaner: Fixed or Portable?

December 14, 2020

Air Quality

As building facility managers make plans to welcome people back to schools, businesses and retail locations in the future, indoor […]

How to Achieve 5 Air Changes per Hour (ACH) in Classrooms enVerid Systems

Making Classroom Air Safer During the Pandemic: A Step-by-Step Path to Optimal Air Changes for COVID-19 Mitigation

December 1, 2020

HVAC Design

Experts recommend at least 5 total air changes per hour (ACH) for classrooms to help ensure the safety of students, […]

enVerid COVID-19 Energy Estimator Infographic

The enVerid COVID-19 Energy Estimator: Revealing the Full Costs of HVAC Strategies

November 23, 2020

Air Quality

We were delighted to welcome our esteemed colleague, Dr. Marwa Zaatari, P.E., an ASHRAE Distinguished Lecturer and member of the […]

Mitigating COVID-19 risk in classrooms

Introducing enVerid’s Comprehensive, Free Guide for Improving Classroom Air Quality for COVID-19 Mitigation

November 16, 2020

Air Quality

The negative effects of poor air quality in the learning environment have been known for years, but the current pandemic […]

K-12 students in classroom

COVID Mitigation in K-12 Classrooms: Can’t We Just Open the Windows?

November 11, 2020

Air Quality

The enVerid team just wrapped up a webinar series on COVID & Indoor Air Quality and all sessions are now […]

Air changes in K-12 schools

Air Change Rates 101: Ventilation, Air Filtration are Building Blocks for K-12 Covid-19 Mitigation Efforts

October 28, 2020

Air Quality

Just this month, the CDC updated its guidelines to reflect what scientists and air quality experts have been saying for […]

enVerid COVID & IAQ New Best Practices webinar series

COVID & IAQ: New Best Practices Webinar Series Offers Insights from ASHRAE

October 27, 2020

Air Quality

During October, we launched the enVerid Systems COVID-19 and IAQ: New Best Practices Webinar Series featuring experts from ASHRAE’s Epidemic […]

K-12 School

K-12 Schools: The Most Important Lessons May Be About Indoor Air Quality

October 1, 2020

Air Quality

Indoor Air Quality (IAQ) research has been developing quickly as we learn more about SARS-CoV-2, the virus that causes COVID-19, […]

Luke Leung, PE, LEED Fellow, Member ASHRAE Epidemic Task Force

COVID-19 and Indoor Air Quality: New Best Practices Webinar Series

September 24, 2020

Air Quality

By Christian Weeks As K-12 schools and universities have reopened with every possible combination of remote and in-person learning, it’s […]

Minimum ventilation and high-efficiency air filtration video

ASHRAE’s Updated Commercial Guide Recommends High-Efficiency Filtration for COVID-19

August 25, 2020

Building Standards

Until recently the guidance for mitigating airborne virus spread has largely focused on maximizing outside air (OA) ventilation. For months, […]

Wells-Riley equation for evaluating the COVID-19 risk of infection in a 10,000 SF building

6 Frequently Asked Questions about Airborne Transmission of COVID-19

July 15, 2020

Air Quality

Bioaerosols, High Efficiency Filtration & Outside Air Ventilation 1. What are the current recommendations on airborne transmission of COVID-19? There […]

Air filtration plus HVAC Load Reduction saves money while protecting from COVID-19 in NYC office

HVAC Design to Mitigate COVID-19: More Filtration, Not Ventilation in Commercial Buildings

June 30, 2020

HVAC Design

While it has yet to be definitively demonstrated that aerosolized SARS-CoV-2, the virus behind COVID-19, can be transmitted through HVAC […]