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About FIR
What is Infrared?
What is Far Infrared (FIR)?
What is Infrared Sauna?
Is Infrared Heat safe?
Infrared Heating Level Benefits
History of Infrared Sauna
Facts / Research / Quotations on FIR
» The Journal of American College of Cardiology

» Journal of American Medical Association

» The American Journal of Medicine

» NASA National Aeronautics & Space Administration

» Food & Drug Administration

» Clayton’s Electrotherapy

» McGraw-Hill Encyclopedia of Science and Technology

» Clinical Journal of Sports Medicine

» Department of Internal Medicine and University of Oulu, Finland

» University of California Berkeley

» Guyton's Textbook of Medical Physiology

» New Jersey Medical School

» American pain Society

» Saunas To The Rescue by Raymond Francis

» Therapeutic Heat and Cold, 4th Edition

» ‘The Scientific Basis and Therapeutic Benefits of Far Infrared Ray Therapy’ Dr. Sasaki

» Detoxification Through the Skin by Mark Sircus

» Reversing The Aging Process - an Enlightened Doctor's Discovery by Dr. Fouad I. Ghaly

» ELLE Magazine

» Japanese and Chinese Research

» German Research

» American Research

» Finnish and Swedish Research

» Whole-body treatments

Bring home the Spa experience and feel the difference from day one. IFH-329A and IFH-329M will Carve out a slim, healthy and relaxed body in the comfort and privacy of your home.
Heating Pad Series

Far Infrared emitting Heating Pads for Pain Relief, treating Arthritis, Chronic pain and Sport injuries.



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Home > About FIR

Far Infrared Heat Therapy : Question & Answers

What is Infrared?

80% of the sun’s rays are infrared. Our atmosphere allows IR rays in the 1 to 14 micron range to safely reach the earth’s surface. Infrared rays are part of the electromagnetic spectrum which also includes gamma rays, X-rays, ultraviolet, visible, microwaves and radio waves. The only difference between these different types of radiation is their wavelength or their frequency. With increasing wavelength, the frequency, energy and temperature decreases from gamma rays to radio waves. Travelling at the speed of light these heat waves reach the earth’s surface after the earth’s atmosphere has blocked out the hazardous rays.

The electromagnetic spectrum can be divided into: 1. The Optical Spectrum or the spectrum that is visible to the human eye. It includes seven colours: red, orange, yellow, green, cyan, blue and violet. Of the visible lights, red is the colour having the longest wavelengths and violet the shortest. 2. Invisible Lights outside the Optical Spectrum. These include among various invisible light waves; Infra (meaning ‘below’) red, and Ultra (meaning ‘beyond’) violet. Thus, infrared light is ‘below red’ and ultraviolet light is ‘beyond violet’.

In 1800, William Herschel, a German astronomer, while researching the heat effects of the colours of the optical spectrum, found that the temperatures in the colours increased as he went from violet to red. Herschel also discovered that the temperature continued to increase beyond the colour red, into a region of invisible light which he named, “Infrared”.

Infrared lies between the visible and microwave portions of the electromagnetic spectrum. Infrared waves have wavelengths longer than visible and shorter than microwaves, and have frequencies which are lower than visible and higher than microwaves.

Infrared is broken into three distinct segments: near, mid and far-infrared differentiated by wavelength measured in microns. One micron is equivalent to 1/1,000,000 of a meter. Near-infrared is that part of the infrared spectrum that is closest to visible light and Far-infrared is closer to the microwave region. Mid-infrared is the region between these two.


  1. 0.76 to 1.5 microns = Near Infrared
  2. 1.5 to 5.6 microns = Middle Infrared
  3. 5.6 to 1000 microns = Far Infrared

What is Far Infrared (FIR)?
  • Far infrared (FIR) is part of the natural spectrum of light energy emanating from the sun.
  • Because of its specific (longer) wavelength, FIR heat is directly transmitted onto object without heating the air in between.
  • FIR heat due to its physical properties has a deep penetrating power. The radiant heat surrounds us and penetrates deeply into our joints, muscles and tissues, speeding oxygen flow and increasing circulation.
  • When FIR comes in contact with the body, it is able to penetrate well below the skin (up to 45mm), enabling body to sweat at pleasant air temperatures of only 43-66ºC (110-150ºF).
  • Because of its longer wavelength, Far Infrared is not visible to the human eye. However, they can be seen by special instruments that translate infrared into a variety of colours.
  • Far Infrared is a natural form of light energy that is safest of the rays. It should not be confused with harmful ultraviolet radiation. FIR will not sunburn or damage the skin or tissues below it. In fact, it’s a normal heat that is absolutely essential for all living things to remain tranquil, calm and healthy.
  • FIR above all, provides numerous health benefits in highly enjoyable and comfortable environment with absolutely no side effects.

What is Infrared Sauna?

Infrared saunas are basically an incredibly healthy alternative to sweating in a gym or using an old fashion conventional dry heat or steam sauna. They use Far Infrared heat that emulates the sun. The high-tech heating elements move at the speed of light, penetrating human body 1.5 to 2 inches deep. This in turn shakes loose fat and frees toxins. The soothing FIR heat sweats away weight and calories many times more effectively than traditional sauna or even a workout!

Far Infrared Saunas also apply the ancient principle of healing touch therapies for improved cell growth. They warm the injury site to speed healing. Why is infrared heat better than say, a heating pad? Because the vibrational energy of FIR light is unlike that of the heat energy we use for everyday functions, like cooking. Boiling water can damage our skin and yet not heal internal organs. Sunlight heats us in a profound way; however it includes along with the far-infrared rays, the full range of energy in the electromagnetic spectrum some of them dangerous and harmful. sauna-in-spa™ saunas provide only the optimum rage of FIR most suitable for human consumption.

What is Optimum Far Infrared frequency for an FIR Sauna?

Since the light and energy emitted by the sun that we perceive as heat is actually Far Infrared Radiation (FIR), it is also called thermal radiation or thermal light with wavelengths measuring between 5.6 and 1000 microns. The far infrared range of 7 to 14 micron range is the most beneficial. Human Beings also emit energy at 7 to 14 micron range. With human body and the ceramic infrared heaters on the same micron level, FIR heat has no obstruction and can penetrate at the speed of light. With good portion of wavelengths at 9.4 micron – frequency at which a water molecule resonates or vibrates – causes release of cellular toxins such as mercury, aluminium, cholesterol, acids and other toxic gases – resulting in beautification and fitness not experienced with any other device.

How does a Far Infrared Sauna work?

Once the Power button of FIR sauna is activated, the high-tech ACF (Activated Carbon Fibre technology) super conductive heating panels/wires/elements begin emitting FIR at the speed of light, penetrating human body 3.5 to 5 cm (1.5 to 2 inches) deep under skin, muscles and bones. Neither oxygen nor nitrogen molecules in the air can block the FIR wave. FIR sauna works on the ‘conversion’ principal of warming the body on coming in direct contact, without warming the air between the source and the human body. In technical terms, this is called direct light conversion. Less than 20% of the FIR heats the air, leaving 80% available to be directly converted to heat within the body. FIR makes us feel comfortably warm as we perspire profusely, yet our skin and tissues are not hurt by the heat wave.

Before Using
Far Infrared Sauna
While Using
Far Infrared Sauna
After Using
Far Infrared Sauna
The human body responds to this deep heating effect via a hypothalamic-induced increase in both heart volume and rate. The body tissues selectively absorb FIR as the water in the cell reacts in a process called ‘resonant absorption’. This is said to occur when the frequency of FIR matches the frequency of the water in the cell causing toxins to be dropped off into the blood stream and excreted by way of sweat, faeces and urine. If there are tissues under healing or repair, the boost of infrared ensures fullest healing response.

Resonance and vibration loosens unwanted fat and toxins, which further decompose into water, CO2, inorganic salts etc. and then excreted along with sweat from the expanded pores in the skin. Due to deep penetrating qualities of FIR, up to 1.5 in. 2 in. (45mm - 50mm) deep into body’s tissues, there is a heating effect deep in the muscular tissues and internal organs. This deep heating is responsible for healing effect and other health benefits associated with FIR

Is Infrared Heat safe?
According to NASA infrared ‘passive exercise’ was the ideal way to keep astronauts fit during space flight. In hospitals baby care units, incubators are often equipped with infrared heating systems to keep new born babies warm. World over Far Infrared Rays are being used to promote growth in plants, purify polluted air, treat injured athletes, for cooking and even encourage new hair growth. FIR sauna is not only safe, but has multiple benefits revolutionising the way we keep fit.

Far Infrared is a natural form of light energy that is safest of the rays. It should not be confused with harmful ultraviolet radiation. Unlike UV rays, FIR will not sunburn or damage the skin or tissues below it. According to the 9th edition of Clayton’s Electrotherapy, “infrared is the only antidote to excessive ultraviolet radiation”. FIR heat / energy are also capable of neutralizing the negative effects of toxic electromagnetic frequencies (EMF’s). In fact, FIR is a normal heat that is absolutely essential for all living things to remain tranquil, calm and healthy.

Are sauna-in-spa™ Infrared Saunas safe?

sauna-in-spa™ saunas are completely safe and produce the same Far Infrared heat produced by the sun. FIR is a fundamental, indispensable part of life on earth. All creatures in our environment – people, animals, plants – receive and radiate them. Thus, FIR sauna is not only safe, but has multiple benefits revolutionising the way we keep fit. In fact, FIR is a normal heat that is absolutely essential for all living things to remain tranquil, calm and healthy.

sauna-in-spa™ run on worry-free, low voltage energy (8 to 32V) and is tested to UL standards. They are so safe that nails, water, and even touching the heating elements during operation will have no harmful effect!

Far Infrared radiant heat is the most efficient form of heat available. Significantly less operating time is required to maintain the desired warmth compared to furnaces and other radiant heat systems, keeping operational cost to a minimum. Low-voltage radiant heat systems run at 98% to 100% efficiency at any elevation as they evenly heat every area

sauna-in-spa™ products undergo rigorous tests conforming to the highest quality standards

What are the benefits of Far Infrared Sauna?
Far Infrared benefits are immediate and amazing! Regular sports take time and always carry the risk of injury. While active exercise and balanced diet are excellent for good health, an equally good substitute – the amazing new Far Infrared Sauna – lets you stay healthy in pleasant and relaxing way. Soft, soothing Far Infrared heat helps receive the all round ‘training effect’ (30 minute FIR sauna = 10km run) while reading, watching TV, talking on phone, listening to your favourite music or simply relaxing in the comfort of sauna-in-spa™.
Increased Blood Circulation
Infrared sauna is thought to be seven times more effective at detoxifying heavy metals as opposed to conventional heat or steam saunas. Modern diseases are result environmental pollutants. Studies have confirmed that diet and environmental chemicals cause 95% of cancers. They are absorbed into our body through food containing additives, antiseptics, agriculture chemicals etc. The United States Food and Drug Administration (FDA) have found that sweating is one of the most effective ways to expel these chemical and heavy metal toxins from our body. ‘Incurable’ chronic diseases that were thought to have no known cause often disappear once toxin chemicals are gone. Since our FIR sauna is the safest, most efficacious and economical way of depurating stored toxins; this makes it a household necessity.

Our body reacts to the increased FIR heating through the natural cooling process of perspiring. Increased blood circulation stimulates the sweat glands, releasing built-up toxins and waste. Through the perspiration process, acid and waste residue like toxins, sodium, alcohol, nicotine, cholesterol, urea and the potentially carcinogenic heavy metals (mercury, zinc, lead, nickel, cadmium) are removed from the cells.

Cardiovascular Conditioning
Lowers Blood Pressure
Lowers Cholesterol
Lowers Triglycerides

Extensive research by NASA in the early 1980s concluded that infrared stimulation of cardiovascular function would be the ideal way to maintain cardiovascular conditioning in American astronauts during long space flights.

The body responds to the deep heating effect of the FIR via a hypothalamic-induced increase in both heart volume and rate. As body increases sweat production to cool itself, the heart works harder pumping blood at a greater rate to boost circulation, supplying the conditioning benefits of a continuous exercise. Heart rate, cardiac output and metabolic rate increases, while diastolic blood pressure drops, for improved overall cardiovascular fitness. The lower FIR temperature ranges are found to be very safe for those with cardiovascular risk. This conditioning has even greater benefit to those who are unable to exercise. Thus, our FIR saunas will provide overall, systematic treatment of muscles, joints, and body especially for areas often not regularly addressed through movement and exercising.

‘Passive exercise’ of FIR Saunas results in significant lowering of blood pressure, cholesterol and triglycerides

“Regular use of a sauna…may be as effective as a means of cardiovascular conditioning and burning and burning of calories as regular exercise.” Journal of the American Medical Association 8/7/1981

Burn Calories & Weight Control
Improved Muscle Tone and Strength
Body Shaping
Increased Energy levels

Although weight loss from perspiration is quickly regained by re-hydration with water, the FIR effect of sending more blood to the capillaries and converting fats results more than 600 calories burnt in just one 30 minute session – the equivalent of running 10-15 km. As our body expends energy to produce sweat (1gm. sweat requires 0.586 kcal), a moderately conditioned person can easily sweat off up to 1000 gm or more in a FIR sauna session.

Further, when heavy metals are reduced, the metabolic imbalances that were causing poor digestion and weight gain will be corrected. Also, lipophilic toxins stored in fat are decreased making it easier for weight loss.

Because fat becomes water soluble at 110ºF, subcutaneous fat can be released along with the sweat and toxins. The FIR sauna is especially valuable system for those who don’t exercise and those who cannot exercise yet want an effective weight control and fitness program, giving them the benefits that regular exercise brings.

With Infrared Therapy, result is immediate. The infrared Sauna-in-spa® will carve out a younger, taut and shapely, fit body with a boost of energy level at a new high.

Table showing calories burnt by a 150-pound adult in thirty minutes of exercise:

Rowing (Peak effort)


Marathon Running

Swimming (Crawl)

Tennis (fast game) 265
Cycling (10 mph) 225
Golfing (without cart) 150
Walking (3.5 mph)


Bowling 120
production of white blood cells by the bone marrow and killer T cells by the thymus. The overall result is immune system enhancement.

Immune System Enhancement
A typical FIR sauna session will cause a brief 1 to 3ºF increase in body temperature. As the body works to combat this ‘artificial fever’ the body’s immune system is strengthened. This helps in body’s defence against bacteria, microbes and consequent infection. This phenomenon also helps trigger the production of white blood cells by the bone marrow and killer T cells by the thymus. The overall result is immune system enhancement.
Stress and Fatigue Reduction

The most immediate relief offered by the FIR sauna is simple relaxation, as it melts away the stress and tension of urban life. Dilated capillaries lead to improved blood circulation resulting in reduced stress levels. Just a few minutes in the gentle warmth of FIR sauna will give you an overall massaging effect, soothing jangled nerves and knotted muscles. The user will feel rejuvenated and renewed, restored in both body and mind.
Clears Cellulite
Cellulites are gel like lumps made up of fat, water and wastes trapped in pockets beneath the skin. An infrared thermal system warms three times deeply as conventional saunas, causing heavy sweating leading to effective clearing of this kind of unwanted debris from the body.
Relieves Muscle Spasm, Body Pain, Joint Pain and Stiffness
Treats Rheumatoid Arthritis

Deep heating effect of the FIR sauna helps peripheral blood vessels dilate, bringing relief and healing to muscle and soft tissue injuries. Increased blood circulation carries off metabolic waste products and delivers oxygen-rich blood to oxygen depleted muscles, enabling them to recover faster. Muscles relax most readily when tissues are warm, for greater flexibility and range of motion.

FIR heat can easily help ease patients suffering from arthritis, sprains, neuralgia, bursitis, muscle spasm, lower back pain, joint stiffness and several other muscular-skeletal ailments. Much of the stiffness aches and soreness that comes with aging is reduced or eliminated.

Skin Cleansing

The increased heating causes pores of the skin to open up. The profuse sweating achieved within few minutes in an FIR sauna sweats off deeply imbedded impurities (dirt, oil and makeup) and dead skin cells, leaving the skin glowing, immaculately clean and free of body odour.

Increased blood circulation draws the skin’s own natural nutrients to the surface. Your skin will experience firmness, improved tone, elasticity, texture and colour.

Roughness will start declining making way for smooth and soft skin.

Increased blood circulation has also been shown to relieve acne, eczema, psoriasis, burns, lesions and cuts. Further, open wounds heal more quickly, reducing scarring.

Athletic Performance
Now athletes and sportsmen can forget tedious warm-up exercises. They will be able to ready their muscles using our FIR sauna better than standard warm-up exercise. Since pre-competition warm-ups can end up tiring an athlete, our saunas ‘deep thermal therapy’ will offer an exertion-free alternative. The idea of "passive" warm-up before competition is not new. Hot pads and steamy showers are other ways of warming the muscles and improving range of motion in the joints. However, the effectiveness of our FIR sauna is incomparable.

FIR heat therapy can also be used in both the prevention and rehabilitation of overuse injuries and to combat the after-effects of torn muscles and tendons. It can be valuable during warm-up before training sessions and competitions and in cold weather, increasing, as it does, the mobility of joints.

Injuries caused by trauma or overuse, such as ligament injuries and muscle ruptures, are often treated during the acute stage by cooling and bandaging so that the bleeding in the injured area is limited. After the initial 48 hours, FIR heat therapy can be introduced to help the healing process, which, once the risk of haemorrhage is over, is aided by increased blood flow.

Control Diabetes

FIR Therapy can control diabetes. Diabetes is a disease that prevents our body to balance the use of glucose (energy) derived from the food we eat. Common symptoms of Diabetics are: Frequent urination, excessive thirst and hunger, nausea, weakness and fatigue. FIR rays can increase blood circulation to rejuvenate healthy cellular functioning. Cells get a chance to flush out toxins and wastes and replace them with fresh oxygen and nutrients from the blood stream. New research has also shows FIR can inhibit bacterial growth, thus reducing chance of infection which most diabetics are prone to. Overall, FIR saunas help in lowering blood sugar levels.
Bed-Ridden or Wheel Chair Bound Users
FIR saunas make it possible for people in wheel chairs, or those who are otherwise unable to exert themselves, or those who won’t follow an exercising and conditioning program to help improve blood circulation. Our FIR saunas definitely allow more variety in any ongoing training program.

Infrared Heating Level benefits

  • 30 to 35°C for stimulating blood circulation and relaxation
  • 35 to 40°C for pain relief & muscle relaxation
  • 40 to 50°C for physiotherapy e.g. for rheumatoid arthritis
  • 50 to 60°C for increased sweating with high temperature
History of Infrared Sauna

Palm healing, which is a 3000 years old tradition in China, has been based on the healing properties of the natural infrared rays. Chinese researchers consider the band from 2 to 25 microns as the most therapeutic.

Sauna use has been popularised by Finns whose old religion used it as a ceremony for the mental, spiritual and physical cleansing. This science was brought by Finns who migrated to Finland between 5000 and 3000 BC, from an area north west of present day Tibet.

Numerous saunas appear along the Mediterranean towns cities. The first known Sauna Bath appears in the palace of King Minos of Crete in 1700 BC.

Sauna benefits of Far Infrared therapy first began with Socrates providing an answer for depression using light.

While Native Americans developed saunas as sweat lodges, the German physicians have been using whole body infrared therapy for over 80 years.

Dr. Tadashi Ishikowa received a patent on the zirconia infrared heaters in 1965. They were mostly used exclusively by medical practitioners in Japan until they were released for public use in 1979.

The infrared idea has been further refined and sold in the United States since 1981.


The sauna-in-spa™ Far Infrared Saunas are not medical products.
They are not intended to diagnose, treat, cure or prevent any disease. If you are not certain whether you can use this product, please consult your physicians before using it.
  • Consult your personal physician if you are not sure about using any of sauna-in-spa™ products.
  • Consult your physician in case of any active disease, pregnancy, high blood pressure or any surgical implants such as metal pins, rods and artificial joints.
  • It is recommended not to use more than the maximum available time for one session and not more than three times a week for any one person.
  • Drink around 12oz (0.34ltr) of water for every 15 minutes you are in the sauna (drink lots of fluids!!). Dehydration is one of the most common dangers of sauna. To avoid dehydration consume sufficient amount of fluid before, after and if need be, even during the sauna session.
  • At any point during the sauna if you do not feel well, leave immediately!
  • Avoid excessive use of lotion prior to sauna usage.
  • Keep initial sauna usage to a minimum until you become accustomed to the heat.
  • Our products are not intended to diagnose, treat, cure or prevent any medical condition.
  • Testimonials represent personal experiences and may differ among individuals.
  • Review manual carefully before using the sauna.