O2 oxygen

Oxygen - Wikipedi

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A measurement of your blood oxygen is called your oxygen saturation level. In medical shorthand, you may hear it called a PaO 2 when using a blood gas and an O 2 sat (SpO2) when using a pulse ox. Oxygen: Directed by Alexandre Aja. With Mélanie Laurent, Mathieu Amalric, Malik Zidi, Laura Boujenah. A woman wakes in a cryogenic chamber with no recollection of how she got there. As she's running out of oxygen, she must rebuild her memory to find a way out of her nightmare OXYGEN FREEJUMPING TRAMPOLINE PARK AT THE O2. The O2 Greenwich is our newest trampoline park. From restaurants to bowling, trampolining is one of many things to do at the O2 Peninsula. So what's special about our trampoline park at The O2? Firstly, we've got lots of interconnected trampolines for you to explore and many other zones

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OXYGEN THERAPY NUR 422 OVERVIEW Introduction Indications Oxygen delivery systems Complications of oxygen therapy Goal of oxygen therapy To maintain adequate tissue oxygenation while minimizing cardiopulmonary work O2 Therapy : CLINICAL OBJECTIVES Correct documented or suspected hypoxemia Decrease the symptoms associated with chronic hypoxemia Decrease the workload hypoxemia imposes on the. Chemical name :oxygen Supplier's details : Oxygen Product use :Synthetic/Analytical chemistry. Synonym :Molecular oxygen; Oxygen molecule; Pure oxygen; O2; UN 1072; Dioxygen; Oxygen USP, Aviator's Breathing Oxygen (ABO) SDS # :001043 Airgas USA, LLC and its affiliates 259 North Radnor-Chester Road Suite 100 Radnor, PA 19087-5283 1-610-687-525 In this video we'll balance the equation Na + O2 = Na2O and provide the correct coefficients for each compound.To balance Na + O2 = Na2O you'll need to be su.. Oxygen (O2) Oxygen (O 2) constitutes 21% (by volume) and over 46% (by weight) of the earth's crust and is the most plentiful element. It is obtained for industrial use by distillation of liquified air. Medical uses include respiratory therapy, incubators and inhaled anesthetics. Oxygen (O 2) is part of all gas mixtures for spacecraft, scuba. Oxygen was the atomic weight standard for the other elements until 1961 when it was replaced by carbon 12. Oxygen made a good choice for the standard before much was known about isotopes because although there are 3 natural isotopes of oxygen, most of it is oxygen-16. This is why the atomic weight of oxygen (15.9994) is so close to 16

242k Followers, 4 Following, 9,223 Posts - See Instagram photos and videos from OXYGEN GYMS | اوكسجين جيم (@o2_gyms PDC Machines Oxygen Diaphragm Compressors. PDC Machines' diaphragm oxygen compressors are the preferred choice when contamination-free, leak-tight oxygen compression is required. Our oxygen compressors are designed to afford you high quality, high reliability, low maintenance and extended service intervals Oxygen is a chemical element.It has the symbol O and atomic number 8. It is the third most common element in the universe, after hydrogen and helium.Oxygen is more than a fifth of the Earth's atmosphere by volume. In the air, two oxygen atoms usually join to make dioxygen (O 2), a colourless gas.This gas is often just called oxygen. It has no taste or smell.It is pale blue when it is liquid or.

الأكسجين oxygen (O2) - موسوعة العلو

O2 Oxygen, Bologna, Emilia-Romagna. 508 likes · 15 talking about this. O2 Oxygen è una green factory che si inserisce nel panorama metropolitano italiano, un'area per live events avvokta da un.. Oxygen therapy is an expected competency of all Respiratory Therapists regardless of the practice setting. Respiratory Therapists work in a variety of practice settings including but not limited to: • Acute Care (Hospitals) • Complex Continuing Care • Long-Term Care. •. In addition, the OCS patented system ensures an exceptional stability of O2 purity, at +/- 0,2%. Learn more Mobile Oxygen Generator. Forget high pressure cylinders and liquid oxygen deliveries, NOVAIR has designed ModulO2, a compact, mobile and featured with a friendly use system oxygen generator. Learn mor

Understanding Oxygen Saturation - Verywell Healt

  1. ute) on arterial CO 2 tension (PaCO 2) in patients with acute exacerbation of COPD (that is, Global Initiative for Chronic Obstructive Lung Disease (GOLD) grade IV).The authors found that PaCO 2 increased from 8.4 to 11.4 kPa but that arterial O 2 tension (PaO 2) increased from 4.9 to.
  2. oxygen (O), nonmetallic chemical element of Group 16 (VIa, or the oxygen group) of the periodic table. Oxygen is a colourless, odourless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide; plants, in turn, utilize carbon dioxide as a source of carbon and return the oxygen to the atmosphere
  3. Oxygen O2. 10,199 likes · 217 talking about this. ‎لايوجد ترجمة فعلية لكلمة اوكسجين تنفس فحسب ثقافة و كتب و الكثير من الصور اوكسجين دمشق
  4. Oxygen. 2021 | TV-14 | 1h 41m | Dramas. After waking up in a cryogenic unit, Liz fights to survive and remember who she is before her oxygen runs out. Starring: Mélanie Laurent, Mathieu Amalric, Malik Zidi
  5. Oxygen is one of the most abundant elements in the universe, which makes it a bit ironic, then, that people with breathing problems are unable to get enough of it. The body needs to maintain a normal oxygen level, which requires a certain amount of circulating oxygen in the blood at all times to effectively nourish the cells, tissues and organs.When blood oxygen levels drop below normal, a.

In this video we'll balance the equation NH3 + O2 = N2 + H2O and provide the correct coefficients for each compound.To balance NH3 + O2 = N2 + H2O you'll nee.. Oxygen analyzers provide valuable measurements in combustion control, process quality, safety and environmental applications. These are used in a variety of measurement scenarios including, but not limited to, boiler trimming in power plants, furnace optimization in refinery and petrochemical applications, process safety in vent headers, and product quality in ethylene production Oxygen therapy, or O2 therapy, is a medical therapy wherein supplemental oxygen is given to anyone suffering from oxygen deficiency. The purpose of oxygen treatment is to help patients breathe better and improve their blood oxygen levels. For people experiencing shortness of breath and other signs and symptoms of low oxygen, there are numerous. What is O2 Therapy ? Oxygen therapy is the administration of oxygen at concentrations greater than that in room air to treat or prevent hypoxia. 7. Types of Oxygen TherapyTypes of Oxygen Therapy • Giving Oxygen more than 21% at ambient atm pressure • Giving Oxygen more than 21% at high atm pressure ( >1 atm) Orthobaric Hyperbaric 8 Specific heat of Oxygen Gas - O2 - at temperatures ranging 175 - 6000 K. Specific heat (C) is the amount of heat required to change the temperature of a mass unit of a substance by one degree. Isobaric specific heat (Cp) is used for substances in a constant pressure (ΔP = 0) system

Oxygen makes things burn much faster. Think of what happens when you blow into a fire; it makes the flame bigger. If you are using oxygen in your home, you must take extra care to stay safe from fires and objects that might burn Oxygen (O2) is the third-most abundant element by mass in the universe after hydrogen (H2) and helium (He). It is also the most abundant element by mass in the Earth's crust. For living organisms, uptake of O2 from the air is the essential purpose of breathing Oxygen is distributed from the tank through a tube. It enters the lungs through nasal tubes, a face mask, or a tube inserted directly into the person's windpipe. Hyperbaric oxygen therapy

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  1. The O2 Remote retractable oxygen tubing system can greatly reduce the risk of falls and injuries by keeping the excess oxygen tubing out of the way. Affordable, simple to use and set up, the O2Remote oxygen tube reel is a must have for anyone on home oxygen. US Pat.1100819
  2. The gasboard-7500H ultrasonic oxygen sensor module is to measure oxygen flow and concentration in binary gas for oxygen concentrator or ventilator. It is with higher accuracy and shorter response time
  3. Istilah oxygen diciptakan oleh Antoine Lavoisier pada tahun 1777, yang eksperimennya dengan oksigen berhasil meruntuhkan teori flogiston pembakaran dan korosi yang terkenal. Ia juga berhasil menjelaskan peran oksigen dalam pembakaran
  4. Oxygen is one of the basic chemical elements. In its most common form, oxygen is a colorless gas found in air. It is one of the life-sustaining elements on Earth and is needed by all animals. Oxygen is also used in many industrial, commercial, medical, and scientific applications. It is used in blast furnaces to make steel, and is an important.
  5. ska risken för förväxling på svenska med syra och som en internationell anpassning kallar man ibland, till exempel på gastuber, ämnet för oxygen.Syre är vid standardtryck och -temperatur (STP) en gas, syrgas, O 2, som förekommer i atmosfären i en halt av cirka 21 volymprocent

Sauerstoff (historisch auch Oxygenium, kurz Oxygen, genannt; gebildet aus altgriechisch ὀξύς oxýs scharf, spitz, sauer und -gen, zusammen Säureerzeuger, Säurebildner) ist ein chemisches Element mit dem Elementsymbol O. Entsprechend seiner Ordnungszahl 8 steht es an achter Stelle im Periodensystem und dort zusammen mit den Elementen Schwefel, Selen, Tellur, Polonium und. (O2) Oxygen Sensor Installed. So, one of the most important sensors in modern cars is the oxygen sensor. Also known as the (O2) sensor because (O2) is the chemical formula for oxygen. The (O2) oxygen sensor monitors how much unburned oxygen is present in the exhaust as the exhaust exits the engine (O2) oxygen sensors are used to confirm that the proper air fuel ratio is actually reaching the engine. Measuring the (O2) oxygen level in the exhaust provides a good gauge of what the fuel to oxygen ratio is. Consequently, Its job is to measure the amount of unburnt (O2) oxygen exiting the engine

O2 - Wikipedi

Structure, properties, spectra, suppliers and links for: Molecular oxygen, Oxygen, superoxide, 7782-44-7, 11062-77-4, 17778-80-2 Hyperbaric oxygen therapy (HBOT) is a different type of oxygen therapy. It involves breathing oxygen in a pressurized chamber or tube. This allows your lungs to gather up to three times more oxygen than you would get by breathing oxygen at normal air pressure. The extra oxygen moves through your blood and to your organs and body tissues Oxygen therapy is a type of treatment used by some people with chronic obstructive pulmonary disease (COPD). It is sometimes called supplemental oxygen. 1 COPD causes lung damage that can keep the lungs from being able to absorb enough oxygen. If the body does not have enough oxygen, it cannot function as well as it should Find phones, tablets, mobile broadband, and sim only deals on the UK's Best Network for Coverage. Find out more about My O2, Priority, O2 Refresh, O2 Wifi and much more, at O2.co.uk OXIGEN is pH balanced with electrolytes and boosted with oxygen - all to help you Recover + Rise. And unlike most bottled waters that are recyclable, OXIGEN is made from 100% recycled plastic - healthy for body and planet. Learn more about how OXIGEN can help you Recover + Rise

O2 Analyzer Nova Gas Portable Oxygen Analyze

Right: coordination around oxygen in the O2 structure of Na 0 [Mg 0.28 Mn 0.72]O 2, in which oxygen is coordinated octahedrally by two Mn and one Mg from the TM layer and three vacancies from the. Oxygen Freejumping, the UK's leading Trampoline Park recently opened their new trampoline park at The O2. With two floors of unlimited fun, the park consists of a variety of zones where there's something suitable for everyone. From a dodgeball court and professional trampolines, to the Ninja Warrior obstacle course and Airventure, the new. Find here Oxygen Sensor, Industrial Oxygen Sensor manufacturers, suppliers & exporters in India. Get contact details & address of companies manufacturing and supplying Oxygen Sensor, Industrial Oxygen Sensor, PPM Oxygen Sensor across India We would like to show you a description here but the site won't allow us

Where is Oxygen Sensor Bank 1 And Bank 2 Located On Your

Inspired Oxygen Concentration (Fi O2 ): %. Mean Airway Pressure (MAP): mmHg. Pa O2 (partial pressure of arterial O 2 ): mmHg. Oxygen Index (OI) =. Oxygen Index (OI) =. FiO 2 x MAP x 100 O2 Ajloun. December 12, 2020 ·. عرووووض نااااااااااار ناااااااااار على مستوى المملكه ولأول مره بأكواخ عجلون الخشبيه فقط هاذ الأسبوع اجواء ولا اروع روااااااااق على الاخر بأحضان الطبيعة بين. The Atlas Scientific gaseous oxygen sensor has been designed to read O 2 levels from 0 - 420 ppt. The sensor comes calibrated and ready to use right out of the box. The EZO-O2™ comes with: One embedded oxygen sensor, and one data cable with 5 pin male header How to Change Kia O2 Oxygen Sensor. Start by turning off the ignition. Next, open the hood. We recommend disconnecting the negative battery terminal. Locate the upstream oxygen sensor Bank 1 Sensor 1. Disconnect the oxygen sensor electrical wire. Remove the oxygen sensor using an oxygen sensor socket

Oxygen Generators Oxygen Generation Systems O2 Gas

  1. istration (OSHA) specifies that a hazardous atmosphere may include one where the oxygen concentration is below 19.5% or above 23.5
  2. Our Oxygen Gas Analyzers are Reliable, Accurate and provide years of trouble free performances. Typical applications include O2 analysis for Blanketing/Inserting and Vapor Recovery in petrochemical applications and flue gas O2 and combustibles analysis for combustion efficiency applications. Product Details: Excellent performance Accurate dimensio
  3. The O2 Medi-Facial is a fantastic treatment to add to your existing acne treatment plan, as oxygen is known to accelerate wound healing and destroy acne-causing bacteria. Other ingredients such as Chamomilla Flower Extract has antibacterial properties that help to reduce redness, soften and soothe dry skin, while Beta Glucan stimulates collagen.
  4. 산소(일본어: 酸素, 영어: Oxygen)는 화학 원소의 하나로, 원소 기호는 O(라틴어: Oxygenium)이고 원자 번호는 8이다. 일반적으로 산소원자 두 개가 결합하여 무색, 무미, 무취인 기체 상태로 존재한다. 공기의 주성분 중 하나로, 지구뿐 아니라 우주 전체에 걸쳐 다른 원소와 공유 결합된 상태로 널리 퍼져 있다
  5. Oxygen definition is - a chemical element that constitutes 21 percent of the Earth's atmosphere, that is capable of combining with all elements except some noble gases, that is active in physiological processes of almost all known organisms, and that is involved especially in combustion. How to use oxygen in a sentence
  6. JoyTube O2 Oxygen Sensor Plug M18 x 1.5 with Inner Hex Head Universal Fit with Brass Oring for Motorbike and Other Transportation, 304 Stainless Steel, Pack of 2 4.6 out of 5 stars 53 1 offer from $14.9
  7. Liquid phase oxygen can be delivered to large or small onsite cryogenic vessels.Onsite production and pipeline delivery are also cost-effective options in many applications requiring liquid oxygen. Delivery of liquid cylinders is also an option

Normal Blood Oxygen Level: What's Normal for Me

Oxygen (O2 ) detector is novel-looking, compact and portable, which is designed for detecting oxygen concentration. It is equipped with high-quality gas sensor to ensure accurate measurement and stable performance wit PSA oxygen generator system components. 1) Air compressor — The power of the air compressor is selected according to the customer's altitude. The higher the altitude, the greater the air compressor power. 2) Air storage tank — The size of the air buffer tank is related to the size of the air compressor model.Which is generally included in the air compressor Welcome to the 21st century of o2 simulators. The iO2 was originally developed as tool to aid in the diagnosis of catalytic converter and oxygen sensor fault codes.We believe this is the most intelligent oxygen sensor simulator available, that's why we named it the iO2 At six centers, 203 patients with hypoxemic chronic obstructive lung disease were randomly allocated to either continuous oxygen (O2) therapy or 12-hour nocturnal O2 therapy and followed for at least 12 months (mean, 19.3 months). The two groups were initially well matched in terms of physiological

Topical Oxygen Emulsion: A Novel Wound Therapy | JAMA

Oxygen (2021) - IMD

Oxygen Freejumping At The O2, Greenwich Trampoline Par

An Oxygen atom (technically O1) cant live on its own it gets lonely. It combines with itself. So really its O2 (or for short periods O3 or Ozone if you prefer but it prefers 2 atoms because 3 is a crowd but it cant live just with itself it gets lonely! Weird or what) Now O2 or Oxygen as we know it cannot be compressed into a liquid O2 delivery vs. PaO2. Definition. Oxygen delivery is defined as the amount of oxygen delivered to the capillaries per minute. It is calculated by the following formula: DO2=CO x CaO2 (mL/min/m2) So oxygen delivery is dependent on cardiac output as well as the arterial oxygen content JEGS carries a complete line of exhaust oxygen sensors, O2 fittings & plugs, O2 bungs and exhaust accessories from JEGS, ARP, Bosch, Denso, Hooker Headers, Moroso, Stainless Works and more. JEGS carries exhaust accessories and O2 sensors at the lowest available prices ready to ship to your door! Top Sellers. JEGS O2 Sensor Fitting 18mm x 1.5. ASTM G93 and CGA G-4.1 standard cleaning for components used in an oxygen-enriched environment Parts that are used in the production, storage, plus distribution of liquid and gaseous oxygen can be cleansed with our oxygen cleaning process. Complying with ASTM G93 and CGA G-4.1 standards, the process is ideal for components used in an oxygen.

Oxygen cycle, circulation of oxygen in various forms through nature. Free in the air and dissolved in water, oxygen is second only to nitrogen in abundance among uncombined elements in the atmosphere. Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO 2 ). CO 2 is then taken up by algae and. Technically, $\ce{O2}$ is molecular oxygen. $\ce{O}$, atomic oxygen, only exists under rare conditions; e.g. for a very short time after the molecule is dissociated by radiation, or where air pressure is so low that dissociated oxygen does not find a partner to recombine quickly. Whenever one refers to an element, it is likely in the form of molecules, or metallically bound, except for the. The oxygen sensor is an important part of a car engine. This device is part of a car's emissions control system: it's roughly the size of a spark plug, and tests the oxygen levels in a car's exhaust stream. A dirty oxygen sensor can cause.. Molecular oxygen is ionised at the porous platinum electrodes. PtO → Pt + ½ O2 ½ O2 + 2 e-→ O2-The platinum electrodes on each side of the cell provide a catalytic surface for the change in oxygen molecules, O 2, to oxygen ions, and oxygen ions to oxygen molecules. Oxygen molecules on the high concentration reference gas side of the cell.

How to Balance Na + O2 = Na2O (Sodium plus Oxygen Gas

  1. ology Relating to the Compatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres. G127 - 15. Standard Guide for the Selection of Cleaning Agents for Oxygen-Enriched Systems. G128 / G128M - 15. Standard Guide for Control of Hazards and Risks in Oxygen Enriched Systems. G131 - 96 (2016)e1
  2. Oxygen cleaning services can be defined as specialized cleaning for components, equipment, piping, and systems used in the production, storage, distribution and use of gaseous oxygen (GOX) and liquid oxygen (LOX). LOX is the liquid form of elemental oxygen (O 2 ). Examples of industries that use LOX systems include Aerospace, Military and.
  3. s. Pro O2 , LLC. is a leading provider of industrial oxygen concentrator products. We were launched in 2018 as the non-medical division of Nidek Medical Products, Inc. Our machines are proudly made in the United States, and with our strong international presence, our machines can be found in 24 countries spanning 6 continents

EWOT (Exercise with Oxygen Therapy). Maxx O2 Exercise System. Unsurpassed quality, features and oxygen filtration. Our EWOT system uses a patent pending positive pressure outflow, HEPA filters and a true adjustable altitude option. Compare before you buy an EWOT system The oxygen (O2) sensor is a device which produces an electrical voltage when exposed to the oxygen present in the exhaust gases. The sensor is mounted in the exhaust manifold or turbocharger outlet and is electrically heated internally for faster switching when the engine is running. When there is a large amount of oxygen present (lean mixture. Our high quality, affordably-priced oxygen analyzers offer: Electrochemical sensors that last up to 3x longer than fuel cell type sensors. Percent or trace oxygen readings as low as parts per billion. Wall mounted options for continuous measurements; portable options for spot measurements. NEMA 1 (general purpose) to NEMA 7 (explosion. Step 7: Install new oxygen sensor. Install the new oxygen sensor, which we showed you how to buy online for under under $100 in reverse order. It is recommended to apply anti-seize compound on the threads of the new O2 sensor. It will help to prevent seizing of sensor, makes it easier to remove it next time Recommended by Skincare Professionals, Celebrities, Make-up Artists and Stylists all over the world. The Red Carpet go to Oxygen Facial used by A-listers everywhere for their glow-ready moments

Glass and Candle Experiment - Air exerts pressure + Oxygen

Simplifies Oxygen (O2) Use. Easy to use online calculator and mobile App for oxygen cylinder duration estimation. The free calculator & app is ideal for technicians, therapists, patients and caregivers to easily calculate the approximate available oxygen remaining in an oxygen cylinder, based on the patient's device and cylinders size & contents FOR EMERGENCY AFTER HOURS OXYGEN - DIAL 0785641700. We supply all medical oxygen needs, including oxygen concentrators, oxygen cylinders, masks, oxygen humidifiers, Oxygen Portable Concentrators etc. We also hire out all the above mentioned equipment at the best prices in the industry. Please contact us to buy or hire any of our oxygen equipment

Oxygen (O2) Gas Monitoring Systems by Analo

The Oxygen O2 sensor is located in your vehicle's exhaust system, usually on the exhaust manifold or close to the engine. There may be several oxygen sensors on your vehicle. These sensors are always located in the exhaust gas flow of your vehicle. Most cars have one O2 sensor located close to the engine, typically in the exhaust manifold GMC Sierra 1500 Classic Hybrid V8 5.3L Upstream 2 Piece O2 Oxygen Sensor Set. 2007. GMC. Sierra 2500 HD. GMC Sierra 2500 HD with New Body Style V8 6.0L Upstream 2 Piece O2 Oxygen Sensor Set. 2008-2010. GMC. Sierra 2500 HD. GMC Sierra 2500 HD V8 6.0L Upstream 2 Piece O2 Oxygen Sensor Set Derby. Croydon. The O2 (Greenwich, London) The O2 Little Os Toddler Session. Acton Derby Croydon The O2 (Greenwich, London) The O2 Little Os Toddler Session. Preferred Location. Subscribe to our newsletter. Olark launch button clip path. Envelope Icon Buy Bodeman - Downstream O2 Oxygen Sensor for Audi A4 A5 A6 A7 A8 Quattro Q5 S4 S5 SQ5 - #ST-24753, 250-24753 online at an affordable price. Get special offers & fast delivery options with every purchase on Ubuy; the leading international shopping platform in Saudi Arabia. B083FTT6R

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2.1.8 Oxygen delivered by nasal cannula at a rate of less than 4 Lpm will not be routinely humidified for adult clients. All oxygen administered by nasal cannula, to pediatric clients, should be humidified. (See Appendix A ). 2.1.9 Most portable oxygen cylinders have a full oxygen capacity of 2000 psi; if the pressure gaug Above all, we want to protect the health and safety for both you and your loved ones. We appreciate your patience and support during this period of transition. Feel free to email or call with any questions, hello@o2salonmaine.com or (207) 253-1550 . Team O2 We stock a wide range of Medical Mains Static Oxygen Concentrators from leading Manufacturers such as Caire (Airsep) Sequal, Devilbiss, Invacare, Kroeber, Nidek and Inogen. If you need any help or advice about oxygen concentrators or a cost for a specific item, please call us now on 0345 100 0084. browse all categories O2 exiting an oxygen cylinder will be slightly cooler, but negligible, since only a small amount of oxygen is needed to maintain fish. AIR VERSUS OXYGEN Oxygen will maintain higher quantities of fish, but extra care must be taken when using pure oxygen. To understand the fundamentals or air versus oxygen, each should be individually discussed

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Lead Free. 2 Manufacturer. 3 Model. Max-125M. 12 months Warranty. Part NumberR140P07-001. Replacement For. Maxtec [R114P70 - Max-16] Covidien [4-072214-00, 980, 840, 740, 760, PB2000 Tester The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust as the exhaust exits the engine. Monitoring oxygen levels in the exhaust is a way of gauging the fuel mixture. It tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen) Remove Item. A specifically designed oxygen delivery aid for Thermovent® T, provides the easiest and most comfortable way of supplying oxygen enriched humidified air. Product Benefits. Clips easily onto the Thermovent T. Supplied with 150cm connecting tube and coned mount for immediate connection to the oxygen source