OHD OHD specializes in the instrumentation and software to help protect your employees’ health and manage occupational risks.

OHD is the manufacturer of the QuantiFit2 - the fastest and most accurate fit testing device on the market. Occupational Health Dynamics offers a range of products and services to help you protect your employees and manage your occupational risks. Whether you are looking for The QuantiFit2 Respirator Fit Tester, Noise Dosimeters, Audiometer, Vision Screener, Breath Alcohol Instruments, or a Sound Level Meter, we can provide you with a complete solution.

12/03/2025

If you’ve ever compared CNC and CNP fit test results and wondered why the numbers didn’t match, you’ll want to read this. 👇

In our latest blog, Dr. Stephanie Lynch, CIH, CSP, OHD’s Senior Technology and Research Manager, dives into how your testing method can change what your fit factor really means and why CNP and CNC results can’t be compared one-to-one. She also highlights how not understanding the differences between these methods can lead to false assumptions about respirator performance.

Read her full breakdown: https://ohdglobal.com/cnc-vs-cnp-fit-factor-explanation/

Before the year wraps up, take a minute to check when your respirator fit testing instruments are due for calibration. S...
12/01/2025

Before the year wraps up, take a minute to check when your respirator fit testing instruments are due for calibration. Staying on an annual schedule helps keep your results accurate, your records audit-ready, and your team protected.

If your instruments are due for calibration soon, our prepaid calibration service packages make it easy to lock in pricing, plan ahead, and avoid last-minute downtime.

👉You can compare packages and choose what fits your program by visiting https://ohdglobal.com/calibrations/.

11/24/2025

Not sure which fit testing device is the right choice for your team?

OHD has you covered! Our Find Your Fit page makes it easy to find the right respirator fit testing device for your specific needs. Just answer a few quick questions and we’ll point you to the solution that fits your program best. No guesswork, no wasted time.

Take the quiz now!
🔗ohdglobal.com/find-your-fit/

We were glad to be in Irondale last week for the Alabama AIHA Local Section Fall Conference.Dr. Stephanie Lynch, CIH, CS...
11/17/2025

We were glad to be in Irondale last week for the Alabama AIHA Local Section Fall Conference.

Dr. Stephanie Lynch, CIH, CSP, our Senior Technology & Research Manager, and Mark Gamble, our Southern Regional Sales Manager, spent the day connecting with industrial hygiene professionals and hosting live demos of the AeroFit, QuantiFit2, Svantek noise monitoring instruments, and Gilian air sampling equipment.

A big thank you to everyone who stopped by to chat with us. We appreciate all the conversations and this dedicated industrial hygiene community! 💪

We were honored to be at the AIHA Upper Midwest Local Section PDC, hosted by the American Industrial Hygiene Association...
11/14/2025

We were honored to be at the AIHA Upper Midwest Local Section PDC, hosted by the American Industrial Hygiene Association (AIHA), in C**n Rapids, MN!

Our Mid-American Regional Sales Manager, Kirk Olson, and our National Sales Manager, Booth Armstrong, enjoyed meeting everyone, and were pleased to provide Live Demos and answer questions about all of our solutions.

Thank you to everyone who stopped by our booth. We appreciate all the conversations and the opportunity to support this dedicated industrial hygiene community!

If you’ve ever compared CNC and CNP fit test results and wondered why the numbers didn’t match, this one’s for you.In ou...
11/12/2025

If you’ve ever compared CNC and CNP fit test results and wondered why the numbers didn’t match, this one’s for you.

In our latest blog, Dr. Stephanie Lynch, CIH, CSP, OHD's Senior Technology and Research Manager, dives into how your testing method can change what your fit factor really means and why CNP and CNC results can’t be compared one-to-one.

Read her full breakdown:

Discover how CNP and CNC respirator fit testing technologies differ—and why CNC vs CNP fit factors aren’t directly comparable.

11/11/2025

Today, we pause to recognize those who have served and those who continue to serve.

Your bravery, resilience, and sense of duty inspire us all.

Thank you for your selfless commitment and for the sacrifices that protect our freedoms every day.

OHD CEO Luke Allen and Adam Marczak, our European Business Development Manager, spent four days in Düsseldorf last week ...
11/10/2025

OHD CEO Luke Allen and Adam Marczak, our European Business Development Manager, spent four days in Düsseldorf last week for A+A 2025, connecting with safety and health professionals from around the world and strengthening OHD’s global presence.

They also had a special chance to connect with partners, distributors, and respirator manufacturers including Recom Industriale, SG Safety AS, ABT Sweden AB, SCHAUENBURG Industrietechnik GmbH, Sundström Safety AB, JSP Safety, 3M, Moldex UK & Ireland, BLS Group - Respiratory Protection Products, CleanSpace Technology, CleanAir, MSA - The Safety Company, BartelsRieger Atemschutztechnik GmbH, and GVS Filter Technology.

We’re very grateful for all the conversations, collaboration, and the continued partnerships that help move respiratory protection forward. Great things ahead! 💪

11/07/2025

Recognizing the daily moments that make our team exceptional. 💙

Part 2 of our Office Superlatives is here! It gave us another chance to pause, laugh, and celebrate the people who bring their best, and bring out the best in each other, every day!

11/05/2025

A quieter way to fit test. 🔇

In this clip from our recent Inside AeroFit webinar, OHD's Dylan Staack shares details about AeroFit's patent pending silent operation, one of the key features that makes our new CNC respirator fit tester stand out.

Designed for both disposable and elastomeric respirators, AeroFit removes the noise you’d expect from other devices, creating a pleasant fit testing experience.

Missed the webinar? Watch it anytime on YouTube!
🔗: https://youtu.be/aTcMPF0YKSk

We had the pleasure of spending the day in Shrivenham with our U.K. partners at Shawcity and Managing Director Neil O'Re...
11/03/2025

We had the pleasure of spending the day in Shrivenham with our U.K. partners at Shawcity and Managing Director Neil O'Regan, where our CEO, Luke Allen, and European Business Development Manager, Adam Marczak, joined the Shawcity team for hands-on AeroFit training and a productive strategy discussion.

Always great connecting with a team as dedicated and forward-thinking as Shawcity. Great things ahead! 💪

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2200 Resource Drive
Hoover, AL
35242

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Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

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Our Story

OHD offers a range of products and services to help you protect your employees and manage your occupational risks. Whether you are looking for The Quantifit Respirator Fit Tester, The QuantiCheck for the world’s first quantitative user seal check, Noise Dosimeters, Audiometers, Vision Screeners, Breath Alcohol Instruments, or a Sound Level Meters, we can provide you with a complete, personalized solution.