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New Local law 191: Best Carbon Monoxide Detector in NYC 2021

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local law 191

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Local Law 191:

Local Law 191 amend the administrative code of the city of New York and the New York City building code, in relation to requiring carbon monoxide detectors in commercial spaces. This law goes into effect on January 1, 2021. Based on the statewide Steven Nelson’s Law, Local law 191aka LL191 requires existing commercial buildings with fuel-burning appliances and fire protection systems in Group A-1, A-2, A-3, B, or M occupancies to install carbon monoxide detectors by January 1, 2021. This will cover:

  1. Indoor public assembly spaces except for indoor sporting arenas, which fall under A-4.
  2. Office spaces, including certain libraries and educational facilities.
  3. Restaurants (since they can fall under either public assembly and Group B).
  4. Stores, including department stores, drug stores, and other retailers.

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While carbon monoxide alarms or detectors were already required in residential and certain institutional occupancies, commercial buildings had long been exempted, despite the fact that any enclosed space with fuel-burning appliances can pose a risk of CO poisoning. But a 2014 carbon monoxide leak in a Long Island restaurant, which killed restaurant manager Steven Nelson and sickened 30 others, made the oversight tragically apparent, leading to Steven Nelson’s Law in 2015.


Now the big question comes does this law is applicable to my building or not?. What occupancy type my building has. How can I find out my building zoning jurisdiction since I am not an Architect or Engineer? We got an answer for you. We find out a web tool that will provide you with answers related to your question. Here are a few steps you need to follow.

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Go to WWW.NYCVIO.COM and select from Menu Zoning Analysis. Enter your building information and it will perform the basic zoning analysis.
Check if your building falls under the required occupancy group for the installation of a Carbon Mono oxide detector.

The next question which comes to mind is Where are CO Detectors required?

Following are the location where a detector should be installed
1 Room containing fuel-burning/CO-producing equipment (except kitchens).
2 Any corridor on the floor where said CO-producing equipment is located, as well as one story above and below.
3 Any corridor on a floor where an enclosed parking lot or a loading dock is located, as well as one floor above and below.
4 Offices or booths located within said enclosed garage or loading dock.

The next question is what kind of CO detectors are required?

As per section 908.7.3.1 of the 2014 NYC Building Code, CO detectors under this law must:
1 Have built-in sounder bases.
2 Transmit a signal to a central supervising station.
3 Initiate an audible and visual supervisory alarm at a constantly attended location.
4 Shut down the CO-producing equipment is located in the same room unless the source is a generator.
5 Be installed in accordance with NFPA 720 – 2015 edition, as modified for New York City.
6 Be listed in accordance with UL 2034 and UL 2075.

How do I get this CO detector installation approved?

To make sure that CO detection system plans and specifications are properly designed and installed, the NYC building code requires them to be developed by a New York State Registered Design Professional.

Where should I file the application?

Since carbon monoxide detectors fall under Fire Protection Systems, you’ll have to file a fire alarm application with the FDNY through their FDNY Business portal.

Any recommendations?

With the January 1 deadline looming, time is of the essence. FDNY review timing is estimated at 6-10 weeks for the completion of initial reviews. Additional 6-10 weeks may be required for resubmissions in case of objections.

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