Chimney Design Solutions®

Don't let waste, go to waste.™

Turnkey waste heat recovery solutions, fully modulating centralized exhaust systems for multistory residential bldgs., etc.

[Chimney Design Solutions® @chimneynet]

NYC's New Safety Standards for A2L Refrigerants Have Been in Effect for One Month — Here's What You Need to Know

On May 15, 2026, the NYC Department of Buildings' new rules relating to Safety Standards for Refrigeration went into effect, adding four new sections to Chapter 7000 of Title 1 of the Rules of the City of New York. Driven by Local Law 77 of 2023, this rule aligns the city's Mechanical Code with the transition to lower-GWP A2L refrigerants like R-32 and R-454B.

The rule formally adopts ASHRAE 15-2022 as the governing standard for A2L systems, establishing requirements for refrigerant detection, mitigation actions, prohibited piping locations, machinery room ventilation, and pipe shaft enclosures — including the requirement that refrigerant piping penetrating two or more floor/ceiling assemblies be enclosed in a fire-resistance-rated, ventilated shaft. That provision alone carries significant design and construction implications for multi-story buildings across the city.
Engineers, contractors, and building owners in NYC: these requirements are now in force. If your team hasn't reviewed them yet, now is the time. We offer an accredited lunch & learn, "A2L Refrigerant Line Shafts: Ventilation & Enclosure Requirements," approved for continuing education credit in FL, MD, NJ, & NY. Reach out to schedule one for your team.

[Chimney Design Solutions® @chimneynet]

We honor those who made the ultimate sacrifice in service to our country and for our freedom.

Memorial Day is not just a long weekend — it’s about gratitude, remembrance and reflection. As we spend time with family and friends, let’s also take a moment to recognize their courage and selflessness. 

Our offices will be closed on Monday, May 25, in observance of the national holiday.

#MemorialDay

[Chimney Design Solutions® @chimneynet]

Full rule details here: https://t.co/JWZnR9ELAG

[Chimney Design Solutions® @chimneynet]

NYC Adopts New Safety Standards for A2L Refrigerants — Effective May 15, 2026

The NYC Department of Buildings has adopted new rules relating to Safety Standards for Refrigeration, adding four new sections to Chapter 7000 of Title 1 of the Rules of the City of New York. Driven by Local Law 77 of 2023, this rule aligns the city's Mechanical Code with the transition to lower-GWP A2L refrigerants like R-32 and R-454B.

The rule formally adopts ASHRAE 15-2022 as the governing standard for A2L systems, establishing requirements for refrigerant detection, mitigation actions, prohibited piping locations, machinery room ventilation, and pipe shaft enclosures, including the requirement that refrigerant piping penetrating two or more floor/ceiling assemblies be enclosed in a fire-resistance-rated, ventilated shaft. That provision alone carries significant design and construction implications for multi-story buildings across the city.

Engineers, contractors, and building owners in NYC: this takes effect next month. If you haven't reviewed these requirements yet, the clock is ticking. We offer an accredited lunch & learn, "A2L Refrigerant Line Shafts: Ventilation & Enclosure Requirements," approved for continuing education credit in FL, MD, NJ, & NY. Reach out to schedule one for your team. Full rule details linked in the comments.

#A2LRefrigerants #ASHRAE15 #NYC #NYCMC #LL77 #AIMact #R454B #R32

[Chimney Design Solutions® @chimneynet]

Our team is in Las Vegas today and tomorrow, connecting with industry leaders and innovators at the 2026 AHR Expo and ASHRAE Winter Meeting. Looking forward to the conversations, insights, and what’s next for the HVAC industry! #AHRexpo

[Chimney Design Solutions® @chimneynet]

MARK YOUR CALENDARS!

We’re excited to be at the 2026 New York Build Expo alongside @SLTNSengsys and @LFSystemsNet on March 18 & 19!

Looking forward to connecting with industry peers and discussing practical solutions for life safety and energy efficiency. If you’re attending, let’s connect and talk shop.

[Chimney Design Solutions® @chimneynet]

In this season of gratitude, we pause to say thank you for your continued support and partnership. Sending warm wishes for a joyful and safe holiday season that’s filled with peace, happiness & well-deserved rest! #HappyHolidays

[Chimney Design Solutions® @chimneynet]

Wishing everyone a joyful and restful holiday! We’re grateful for our customers, manufacturers and team members who make everything we do possible and drive our work forward. Happy #Thanksgiving !

[Chimney Design Solutions® @chimneynet]

Our salesman Raggs had a great time at the Enervex Heat Recovery training! He gained invaluable insight into their go-to-market approach, explored new product innovations, and reviewed real-world project applications. It was a great learning opportunity all around — big things ahead, and we’re excited for the future!

[Chimney Design Solutions® @chimneynet]

Today we pause to recognize and express our gratitude for the brave men and women who have served our country with courage and dedication. To all our veterans, thank you for your service and sacrifice.

[Chimney Design Solutions® @chimneynet]

Join us today at the 7x24 Exchange Regional Chapter Conference! We're excited to connect, share insights and discuss the future of pre-fabricated generator exhaust systems in data centers. See you there!

[Chimney Design Solutions® @chimneynet]

Join us today at the 7x24 Exchange Regional Chapter Conference! We're excited to connect, share insights and discuss the future of pre-fabricated generator exhaust systems in data centers. See you there!

[Chimney Design Solutions® @chimneynet]

Today we recognize and celebrate our incredible interns! We are happy to have you on the team and grateful for all of your enthusiasm and contributions. Here’s to the future leaders and innovators of tomorrow! #NationalInternDay

[Chimney Design Solutions® @chimneynet]

We're thrilled to announce that we're partnering with @Enervex to develop a new course, "Thermopumping Chimneys for Waste Heat Capture,” set to be accredited in early September. #LL97 #LocalLaw97

[Chimney Design Solutions® @chimneynet]

Honoring the brave men and women who made the ultimate sacrifice for our freedom. This Memorial Day, we pause to remember their courage and service.

Our offices will be closed on Monday, May 26, in observance of the national holiday.

[Chimney Design Solutions® @chimneynet]

Join us this Thursday at the 14th Annual Spring Symposium, hosted by AFAA-NJ and SFPE-NJ at the Hanover Manor in East Hanover, NJ. Stop by the tradeshow at 7:30 AM to see LF Systems’ life safety controls for stairway pressurization and active smoke exhaust. Then, don’t miss Brian’s 2:15 PM presentation on Stairwell Pressurization Controls.

We can’t wait to see you there!

[Chimney Design Solutions® @chimneynet]

The Chimney Design Solutions team had an incredible time at the ENERVEX Inc. National Sales Meeting in Atlanta last week! The first day was held at ENERVEX’s world-class facility where we explored and discussed fully modulating pressure-based exhaust technology, along with getting exclusive previews of the upcoming new heat recovery innovations. The following day was spent at the Porsche Experience Center, at which sleek design and high-octane thrills left us inspired!

We would like to extend our sincere appreciation and thanks to the entire Enervex team for hosting such a remarkable event. Collaborating with industry pioneers always ignites fresh ideas, and we’re excited to turn this energy and knowledge into transformative solutions!

[Chimney Design Solutions® @chimneynet]

stop by Table 113 to say hello to Mike and discuss insights on draft control & heat recovery! See you there! #ashrae