Carbon monoxide fire detector - U.S. Environmental Protection Agency (EPA) - Carbon Monoxide. Centers for Disease Control (CDC) - Carbon Monoxide. For additional questions on Carbon Monoxide safety in your home, please contact the City of Madison Fire Department's Community Education Unit at (608) 266-4420. Was this page helpful to you?

 
The First Alert ZCOMBO is a z-wave protocol wireless smoke and carbon monoxide alarm. This battery-operated combination alarm will operate with 3rd party, certified z-wave devices enabled with the First Alert protocol and the basic command class required by all z-wave devices. Note: this fire and CO detector is not compatible with Onelink and .... F 35b fighter jet pilot ejects

First Alert Brk Hardwired Combination Smoke and Carbon Monoxide Detector. The BRK SC9120 hardwire combination smoke and CO alarm with battery backup includes these features: quick plug in power connector for easy installation, 120 volt AC inter connectible (with maximum 18 compatible devices 12 other compatible smoke alarms + 6 compatible …Save big on Pixel phones and the Google Pixel Watch 2. Ends 2/24. Shop now. The Nest Protect smoke and CO alarm that thinks, speaks, and alerts you on your phone. Effortlessly hush the alarm on the Nest app if you burned the toast.The CO fire detector is a unique general purpose fire detector which provides very early warning of slow smouldering fires. Ideal for sleeping risks the CO fire ...The 5800COMBO is the industry's first professionally monitored, wireless, combination Smoke and Carbon Monoxide (CO) detector designed to help protect people ...CO1224T Series Carbon Monoxide Detector · i4 Series CO/Smoke Detector Replacement CO Sensor.More effective in detecting flaming fires. • Increased risk of nuisance alarms caused by steam or cooking smoke. Photoelectric smoke detectors. • Use light to ...What to do if a carbon monoxide alarm goes off. If your carbon monoxide alarm is beeping, immediately get out of the building and call the relevant helpline for the fuel type: gas emergency helpline 0800 111 999. Call a registered engineer to check all your fuel-burning appliances. To check if an engineer is on the gas safe register visit www ...Carbon monoxide alarms are essential devices that help protect us from the silent killer known as carbon monoxide (CO). These small devices emit a loud beep or alarm sound when the...Aug 30, 2023 · Best Plug-In First Alert CO600 Plug-In Carbon Monoxide Detector SEE IT Photo: Tom Scalisi A home fire safety plan is incomplete without a set of carbon monoxide detectors, which sense... We stock a range of carbon monoxide detectors and fire alarms from trusted brands such as FireAngel and Aico. Smoke & Heat Detectors Improve fire safety with the 10-year battery heat alarm from FireAngel. This long-lasting FireAngel smoke alarm has a 10-year guarantee and is ideal for kitchen and garage use. For reduced nuisance, opt for a ...CO1224T Series Carbon Monoxide Detector · i4 Series CO/Smoke Detector Replacement CO Sensor.Detection of multiple threats all in one alarm, Universal Security Instruments combo alarms help protect homeowners from smoke, fire, carbon monoxide and ...How to choose an effective carbon monoxide detector that you can trust - find out about the different types and how to choose a safe, user-friendly model. Expert tips on how to buy the best carbon monoxide detector …A beeping carbon monoxide detector should be considered a warning that the carbon monoxide levels in the home are higher than acceptable levels. Kidde carbon monoxide detectors als...Setup is easy - simply scan the QR code on the device to quickly connect it to your Ring Alarm Base Station. You’ll get real-time notifications in the Ring App when smoke or carbon monoxide is detected. Subscription required, sold separately. 1. Requires the Ring Alarm or Ring Alarm Pro Security Kit. Sends notifications to your phone and tablet.Reece Thompson. March 24, 2018. Carbon monoxide detectors are an essential part of keeping your family safe. We highlight the best practices of where you should place the detectors. As important as smoke alarms, they are designed to go off and produce a high frequency, beeping sound when carbon monoxide (CO) levels are considered too high.The International Association of Fire Chiefs recommends a CO detector in the basement since laundry machines, water heaters and furnaces are all potential sources of carbon monoxide -- and are ...A carbon monoxide detector is a must-have for any home. Carbon monoxide can be even more dangerous than smoke because it has no smell, taste or colour and is produced wherever fuel is burned. This includes your furnace, water heater, chimney, wood stove, and also the vehicles in your garage. The risk is greatest in winter due to poor ventilation.Smoke & Carbon Monoxide Detectors ... A smoke and carbon monoxide detector is designed to alert inhabitants to the presence of CO gas or a potential fire. Early ...Yes. Carbon monoxide is always a concern when dealing with any appliance where there is combustion. It is incredibly important to have a carbon monoxide detector for a wood-burning fireplace. Install a carbon monoxide detector about 15 feet away from your wood-burning fireplace.69.99. Add to basket. Wireless Interlinked Smoke & Heat Alarm Bundle, LINKD Alarms, 10 Year Battery, Scotland & England Compliant. (1) £. 91.99. Add to basket. FireAngel FA6620-R Optical Smoke Alarm with 10-year lifetime battery.Find Family First Carbon Monoxide Alarm at Bunnings. ... Fire Safety. Smoke Detectors. Family First Family First Carbon Monoxide Alarm. 4.1 (9) I/N: 4210604. Compare ... Carbon Monoxide Detector Included. Yes. Electrical Product Type. 9V battery. Visible Sensor (Yes/No) No. Battery Type. 9 Volt.Most carbon monoxide detectors have a plastic cover or face plate which can be recycled. With a flat-head screwdriver, gently pry the casing away from the body of the detector. Your detector may have other plastic parts. Be careful to properly identify the material before recycling it. Some parts have plastic "shielding" and can contain metals ...The PAD100-CD is an Analog Addressable carbon monoxide (CO) sensor compatible with any fire alarm control panel that has the Potter Addressable Device (PAD) protocol. The CO sensing portion utilizes a proven electrochemical sensor for accurate detection of CO gas for life safety applications. The sensor and base (not included) are made of a ...A beeping carbon monoxide detector should be considered a warning that the carbon monoxide levels in the home are higher than acceptable levels. Kidde carbon monoxide detectors als...Introduction. Carbon monoxide, or CO, poisoning is the second most common cause of non-medicinal poisoning death. According to the CDC, over 100,000 people seek emergency treatment for accidental CO poisoning each year, and more than 420 people in the U.S. die from it.. Carbon monoxide is found in fumes produced by …The U.S. Environmental Protection Agency says that the average level of carbon monoxide in a home without a gas stove is between 0.5 and five parts per million. The level of carbon...Reason #1 – Low battery issues. Carbon monoxide detectors that are not connected to the grid may face low battery issues. These devices are designed to alert the user when the battery is lower than the minimum limit. In such scenarios, they beep three times. However, faulty devices tend to chirp every 30 to 60 seconds.Jun 17, 2014 · Voice Alarm & an 85-decibel alarm announces a hazard when detected: “Fire!” = smoke or fire or “Warning Carbon Monoxide” = CO gas, or "Replace Battery" when the battery needs to be replaced Operates on 2-AA alkaline batteries, providing reliable detection during a power failure Both of these devices save lives, although they do so in different ways. Smoke detectors alert you to the presence of smoke and possibly fire in your home.The NOTIFIER FSCO-951 is an intelligent carbon monoxide (CO) detector. It offers an addressable solution that meets the UL 2075 standard for system-connected life safety carbon monoxide detection. Features & Benefits: Addressable CO detector; Sleek, low profile design with optional color features; 10-year CO cell with end-of-life warningFireProtect Plus Jeweller · The device registers smoke, sharp jumps in temperature, and dangerous CO levels · It can operate independently from Ajax Hub, ...This detector constantly monitors your home for the presence of smoke and CO. If an event occurs, your system's sirens will trigger and you'll be notified ...Safety Monitors. Air quality monitors are devices designed to monitor and assess the quality of indoor and outdoor air. Most of these devices are portable and compact and are able to measure all essential parameters such as carbon dioxide (CO2), temperature, oxygen, humidity, air volume and air velocity. From £13.97 Inc VAT.The Universal Security Instruments hardwired MIC1509S 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm will provide up to 10-years of continuous protection against 3 deadly threats within the home. Patented Universal Smoke Sensing Technology provides the benefits of both photoelectric and ionization alarms in 1 device to protect against fast ... The Kidde Hardwired Smoke and Carbon Monoxide Detector with Battery Backup and Voice Alerts, model 900-CUAR-V, is a hardwired smoke alarm and carbon monoxide detector combo. It connects to your home's wiring (120-Volt AC power), while 2 AA batteries (included) provide battery backup during the event of a power failure. First Alert 120V Hardwired Photoelectric Smoke and Carbon Monoxide (CO) Alarm With Battery Backup. 4.7. (28) $64.99. Top Rated. #046-0376-8. 9 In Stock. Kidde Worry-Free Smoke and Carbon Monoxide (CO) Detector With 10-Year Sealed Battery. 4.1. CO1224T Series Carbon Monoxide Detector · i4 Series CO/Smoke Detector Replacement CO Sensor.In 2011, most states across the nation adopted new building codes that made it the law that carbon monoxide detectors are required for all one- and two-story family homes. Today, 48 U.S. states have passed legislation requiring carbon monoxide detectors in homes. Check your state's carbon monoxide legislation here .Calvi told Western Mass News that anyone who does not have a smoke or carbon monoxide alarm should get one, especially those that can do double duty. “You …When dangerous levels of CO are detected, a loud audible alarm of 4 chirps will sound and a red warning flash pattern will occur every second. The higher the concentration of CO detected, the quicker the alarm will respond. Never ignore this alarm, further exposure to carbon monoxide can be fatal. If you are experiencing any …This detector constantly monitors your home for the presence of smoke and CO. If an event occurs, your system's sirens will trigger and you'll be notified ...The Universal Security Instruments hardwired MIC1509S 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm will provide up to 10-years of continuous protection against 3 deadly threats within the home. Patented Universal Smoke Sensing Technology provides the benefits of both photoelectric and ionization alarms in 1 device to protect against fast ... Best Smart Detector: Google Nest Protect Smoke Detector and Carbon Monoxide Detector Best Compact: First Alert CO710 Carbon Monoxide Detector Best Portable: GZAIR Travel Carbon Monoxide DetectorThe First Alert CO710 Carbon Monoxide Alarm with 10-year battery uses an advanced electrochemical CO sensor to detect elevated carbon monoxide levels. When CO is detected, the carbon monoxide detector sounds an alarm to warn you of the threat. Carbon monoxide can’t be seen, smelled, or tasted in the air, and it is the leading cause …Your ADT Carbon Monoxide Detector for your ADT smart home security system helps keep you safe by detecting carbon monoxide inside your home. ... BATTERY CAUTION: Risk of fire, explosion, and burns. Do not recharge, disassemble, heat above 212° F (100° C) or incinerate.one smoke alarm in every hallway or landing. one heat alarm in the kitchen. Carbon monoxide alarms should be used if you have heating or cooking appliances fuelled by gas, coal, wood or oil. This does not need to be linked to the fire alarms. More information on the law change is available on Scottish Government website.Dec 31, 2021 ... At a minimum, though, you want to ensure you have a carbon monoxide detector at every level of your home – including your basement. They should ...Leaving an oven on could lead to serious health risks and ultimately death. Leaving an electric oven on and unattended can lead to serious burns or a house fire. If a gas oven is l...Best Smart Detector: Google Nest Protect Smoke Detector and Carbon Monoxide Detector Best Compact: First Alert CO710 Carbon Monoxide Detector Best Portable: GZAIR Travel Carbon Monoxide DetectorKidde Combination Smoke and Carbon Monoxide alarm offers protection from both fire and CO in one device. This unit is a front load, 9-Volt battery operated alarm and features a beeping alert followed by a voice warning that clearly announces the danger by stating, "Fire, Fire, Fire!"or "Warning, Carbon Monoxide!". The designed front loading battery compartment makes battery replacement quick ... Best Overall. Kidde Nighthawk Carbon Monoxide/Explosive Gas Alarm. SEE IT. Best Bang for the Buck. Kidde Battery-Operated Carbon Monoxide Detector. SEE IT. Best Plug-In. First Alert CO600...SITERWELL Smoke Detector Carbon Monoxide Detector Combo with Voice Speaker, Dual Sensor Fire and CO Alarm with LED Light & Test Button, Battery Operated, Auto …This article is about the Consumer Reports' lab tests on smoke and carbon monoxide detectors. It provides information on how they test these detectors, what type of detectors are available in the market, and a list of best smoke and carbon monoxide detectors from their tests with brief descriptions. See moreShop for a First Alert smoke and carbon monoxide alarm or other fire safety products from a brand you can trust. We offer a wide variety of products to keep your home and family safe from fire, gas, CO2 and …Protect your family from fire and carbon monoxide hazards with the Kidde Smoke Detector & Carbon Monoxide Detector Combo. This device has a 10-year sealed battery that never needs to be replaced, and a photoelectric sensor that detects smoldering fires. It also features a loud alarm and a voice warning that tells you the type and location …The NOTIFIER FSCO-951 is an intelligent carbon monoxide (CO) detector. It offers an addressable solution that meets the UL 2075 standard for system-connected life safety carbon monoxide detection. Features & Benefits: Addressable CO detector; Sleek, low profile design with optional color features; 10-year CO cell with end-of-life warning If there isn't any oxygen available, things won't burn at all—and that's one of the secrets fire-fighters use. ... Compares the main different types of carbon monoxide detectors and their advantages and disadvantages. Patents. US2738257: Composition, method, and device for detecting carbon monoxide by William K. Darby, March 13, 1956.Our choice for the best overall carbon monoxide detector is the First Alert Combination Smoke and Carbon Monoxide Detector for its light indication capability. Read our guide below for more about our top picks. First Alert BRK CO511 Carbon Monoxide (CO) Detector Wireless Interconnected with Voice and Location - Combination Smoke Carbon Monoxide Detectors - Amazon.com ... in Smoke Detectors & Fire Alarms . 47 offers from $46.92. First Alert CO615 Dual-Power Plug-In Carbon Monoxide Detector with Battery Backup …Carbon Monoxide Alarm. With electrochemical sensing technology and a clear loud alarm, the FA6813 provides trusted carbon monoxide (CO) detection for your home. Third party tested and approved. For peace of mind. FireAngel are committed to developing innovative technology to provide the highest levels of carbon monoxide detection for your home.The Kidde Firex Combination Smoke & Carbon Monoxide Detector has voice alert that warns of fire, carbon monoxide, or low battery. UL Certified with a 10-year limited warranty. Meets requirements of UL 2034, UL217, NFPA72, The State of California Fire Marshall, NFPA 101, FHA, & HUD. The Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022 will come into force on 1 October 2022. From that date, all relevant landlords must: 1. Ensure at least one smoke alarm is equipped ...Most carbon monoxide detectors have a plastic cover or face plate which can be recycled. With a flat-head screwdriver, gently pry the casing away from the body of the detector. Your detector may have other plastic parts. Be careful to properly identify the material before recycling it. Some parts have plastic "shielding" and can contain metals ...A simple definition for a carbon monoxide fire detector is: “A detector which senses ambient levels of CO to warn of the presence of fire“. At the risk of labouring the point, they are fire detectors not CO alarms, nor are they smoke detectors. They respond purely to carbon monoxide gas, and not to smoke. Patch or ‘blob’ detectors are ...Smoke and Carbon Monoxide Detector 10-Year Lifespan with Replaceable Battery, Photoelectric Fire Alarm and Electrochemical CO Alarm with Test/Silence Button, SC200, 1-Pack Battery Powered 4.5 out of 5 stars 1,651 Our choice for the best overall carbon monoxide detector is the First Alert Combination Smoke and Carbon Monoxide Detector for its light indication capability. Read our guide below for more about our top picks. 601CH Enhanced Carbon Monoxide Detector - Conventional. The CO fire detector is a unique general purpose fire detector which provides very early warning of slow smouldering fires. Ideal for sleeping risks the CO fire detector is also well suited to many applications where heat detection is insufficient but smoke detection causes false alarms.Overview. The ADT Combination Smoke/CO Detector is an easy-to-install, battery-operated safety device that has sensors to detect smoke and carbon monoxide.First Alert ZCOMBO is a state-of-the-art wireless combination smoke and CO alarm designed to provide early warning of a fire or CO. It features a fully insect screened Photoelectric smoke sensing chamber and an electrochemical carbon monoxide sensor, an 85dB horn, a supervised 3V (2 AA batteries) power supply, utilizes one test button to …3-In-1 Smoke Fire and Carbon Monoxide Detector 10-Year Sealed Battery Backup Hardwired Microprocessor Intelligence. Power Source. Hardwired. Features. 10-Year Battery. Jul 6, 2022 · USDA Section 504 grants of up to $10,000 could easily support free smoke and carbon monoxide detectors for senior citizens because the project would remediate health and safety hazards. Severe burns or smoke inhalation from a house fire is hazardous to an older adult’s health. Therefore, most seniors would satisfy the initial criteria. The Kidde Smoke and Carbon Monoxide Alarm with Smart Features gives you the ability to manage your home's fire safety with confidence. ... Fire Safety / Smoke and Carbon Monoxide Detectors. Internet # 318246407. Model # 21031042. Store SKU # 1006751613. Kidde. Smart Smoke and Carbon Monoxide Detector, Hardwired with Voice Alert (180) ...If the carbon monoxide detector is wired to the electrical supply, make sure it has back-up batteries for when the electricity is off. ... Don't burn charcoal in your fireplace. A charcoal fire will not create a chimney draft strong enough to push the …Carbon Monoxide is a gas that you cannot see, smell or taste. Deaths due to CO poisoning most often occur at night, when everyone is sleeping. Our CO detector uses electrochemical sensing technology to detect dangerous levels and sound the siren. With professional monitoring, we are notified and will dispatch fire response to your home ... Save big on Pixel phones and the Google Pixel Watch 2. Ends 2/24. Shop now. The Nest Protect smoke and CO alarm that thinks, speaks, and alerts you on your phone. Effortlessly hush the alarm on the Nest app if you burned the toast.Kidde FireX Front-Loading Photoelectric Smoke and Carbon Monoxide alarm offers protection from 2 hazards, fire and CO in one unit. This AC-wire with battery backup alarm emits a beeping tone followed by a voice warning that clearly announces the danger by saying, "Fire" or "Warning Carbon Monoxide". The uniquely designed front loading battery compartment makes battery replacement quick and ... Smoke and Carbon Monoxide Detectors. Double your detection with a smoke and carbon monoxide detector from Kidde. These combination alarms quickly alert you to both the …The Universal Security Instruments hardwired MIC1509S 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm will provide up to 10-years of continuous protection against 3 deadly threats within the home. Patented Universal Smoke Sensing Technology provides the benefits of both photoelectric and ionization alarms in 1 device to protect against fast …May 13, 2015 · SITERWELL 2.4G Smart Smoke Detector Carbon Monoxide Detector Combo with LCD Display, 2 in 1 WiFi Fire and CO Alarm Detector, Replaceable Battery, Conforms to UL 217 & UL 2034 Standards, 1 Pack dummy Ecoey 4-Piece Set of Magnetic - Magnetic Smoke Detector Installation Tool with 3M Glue, Lation-No Drilling or Screws Required-Fireproof ... Overall, the value of the 10-year battery, the carbon monoxide detector, and digital readout make it the best smoke detector I tested. It also comes highly …Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable 4.7 out of 5 stars 29,886 18 offers from $14.20A simple definition for a carbon monoxide fire detector is: “A detector which senses ambient levels of CO to warn of the presence of fire“. At the risk of labouring …

Take fire safety seriously in your home with a new smoke detector. ... Kidde Worry-Free Smoke and Carbon Monoxide (CO) Detector With 10-Year. Add.. Big sean i don't fuck with you lyrics

carbon monoxide fire detector

The top-selling product within Kidde Smoke and Carbon Monoxide Detectors is the Kidde 10-Year Worry Free Smoke & Carbon Monoxide Detector, Lithium Battery Powered with Photoelectric Sensor. ... fire alarm. hardwired smoke and co detectors. kn cosm iba. dual-sensor smoke and carbon monoxide detectors.Smoke and carbon monoxide (CO) alarms save lives. That’s why we’re on a mission to get as many alarms into as many homes as possible. We strongly urge Hosts to install smoke and carbon monoxide alarms in spaces that use fuel-burning appliances, test them regularly, and make sure their listing description is up to date.A beeping carbon monoxide detector should be considered a warning that the carbon monoxide levels in the home are higher than acceptable levels. Kidde carbon monoxide detectors als...Get quality Smoke & CO2 Alarms at Tesco. Shop in store or online. Delivery 7 days a week. Earn Clubcard points when you shop. Learn more about our range of Smoke & CO2 AlarmsBoth types of alarm are interlinked by radio frequency and do not need WiFi. There is no list of approved suppliers or fitters. When buying your alarm, check that they comply with the following standards: smoke alarms: BS EN14604:2005 heat alarms: BS 5446-2:2003 carbon monoxide detector: British Kitemark EN 50291-1Choose from a range of trade quality carbon monoxide alarms, including the FireAngel digital carbon monoxide alarm CO9D with a 7-year sealed in battery and LED screen, and the FireAngel 7-year life carbon monoxide alarm CO-9X with an advanced electrochemical sensor. We stock mains powered, battery powered or wireless carbon monoxide alarms.3 Pack Combination Smoke and Carbon Monoxide Detector Battery Operated, Travel Portable Photoelectric Fire&Co Alarm for Home, Kitchen. 1,409. 400+ bought in past month. Limited time deal. $3999. Typical: $49.99. FREE delivery Fri, Nov 3. …Find a great collection of Alarms & Detectors at Costco. Enjoy low warehouse prices on name-brand Alarms & Detectors.What to do if a carbon monoxide alarm goes off. If your carbon monoxide alarm is beeping, immediately get out of the building and call the relevant helpline for the fuel type: gas emergency helpline 0800 111 999. Call a registered engineer to check all your fuel-burning appliances. To check if an engineer is on the gas safe register visit www ...Find a great collection of Alarms & Detectors at Costco. Enjoy low warehouse prices on name-brand Alarms & Detectors.Save big on Pixel phones and the Google Pixel Watch 2. Ends 2/24. Shop now. The Nest Protect smoke and CO alarm that thinks, speaks, and alerts you on your phone. Effortlessly hush the alarm on the Nest app if you burned the toast.4.500102. (102) £109.00. to trolley. Add to wishlist. Page 1 of 1. Carbon monoxide is a fatal gas which cannot be easily detected without an alarm. Our range of carbon monoxide alarms has everything you need to protect you and your family from an escape of gas. Our alarms come with a 10-year sensor life, so you can be sure that you're covered ...Take fire safety seriously in your home with a new smoke detector. ... Kidde Worry-Free Smoke and Carbon Monoxide (CO) Detector With 10-Year. Add.Kidde FireX Front-Loading Photoelectric Smoke and Carbon Monoxide alarm offers protection from 2 hazards, fire and CO in one unit. This AC-wire with battery backup alarm emits a beeping tone followed by a voice warning that clearly announces the danger by saying, "Fire" or "Warning Carbon Monoxide". The uniquely designed front loading battery compartment makes battery replacement quick and ... Oct 26, 2023 ... Probably more than you think! According to the National Fire Protection Association (NFPA), you should install smoke detectors on every floor of ...Working smoke and carbon monoxide alarms give early warning of danger and are the most important ways to prevent fatal fires and CO poisoning.A loud, budget-priced choice from a reliable company. A loud alarm at 85 decibels. The battery drawer slides out for quick access. Low battery signal. Green light signals it is working properly. The alarm takes longer to sound for lower CO concentrations. Kidde. Carbon Monoxide Alarm. Check Price. A simple definition for a carbon monoxide fire detector is: “A detector which senses ambient levels of CO to warn of the presence of fire“. At the risk of labouring the point, they are fire detectors not CO alarms, nor are they smoke detectors. They respond purely to carbon monoxide gas, and not to smoke. Patch or ‘blob’ detectors are ...The Ei3030 Fire & Carbon Monoxide Multi-Sensor Alarm is the latest edition to the technologically advanced 3000 Series. Combining Optical, Heat and CO Sensors for the ultimate Fire and CO response, while maintaining the simplicity that installers love.. Containing our proven Thermistor Heat Sensor, Optical Sensor and Electrochemical CO …Feb 12, 2024 · Typically available for $25 or less, the CO400 was the least expensive CO detector we tested, and it was also the fastest at detecting carbon monoxide at both concentration levels. At 250 ppm, its ... .

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