An unpleasant odor in the refrigerator is not just discomfort, but a signal of possible bacterial growth or problems with ventilation. Even the highest quality equipment can begin to emit a specific aroma if you do not follow the operating rules or choose the wrong model.
Many users mistakenly believe that the smell depends solely on the quality of the products, forgetting about the design features of the unit itself. Which refrigerators do not smell? The answer lies in the combination of modern air purification technologies and the right choice of materials.
In this article we will look at how deodorization systems work, why in some models the odor is absorbed into the plastic, while in others it is neutralized at the molecular level. Understanding these processes will help you choose a technique that will preserve food freshness for many years.
The nature of odors: why they appear
The main reason for the appearance of persistent aromas is the circulation of air inside the chamber. In models with manual defrosting moisture settles on the walls, creating an ideal environment for the development of mold and bacteria. It is the products of their vital activity that most often become the source of mustiness.
The situation is aggravated if the internal coating is made of low-quality porous plastic. Such materials have the property of adsorbing odors, like a sponge. Acrylic coatings or surfaces with antibacterial impregnation (for example, silver ions) are much less likely to absorb foreign odors, since they have a smooth structure and suppress the proliferation of microorganisms.
⚠️ Attention: Never use abrasive cleaners to wash the internal plastic. Microscopic scratches will become an ideal refuge for bacteria that cannot be washed out, and the refrigerator will begin to smell again.
It is also worth considering the ventilation system. In units where the air is not forcibly renewed, odors mix and stagnate. Modern systems multi-flow cooling prevent this effect by constantly passing air through filters.
Air purification and deodorization systems
Technologies that allow the refrigerator to “not smell” are based on the use of special filters. The leaders in this area are systems based on activated carbon. They work on the principle of adsorption: passing through the filter, the air flow leaves odor molecules on the carbon granules.
More advanced models are equipped with plasma or ionizing generators. They not only retain odor, but actively destroy bacteria and viruses by oxidizing organic compounds. Such systems are often found in premium lines of brands Samsung, LG and Hitachi.
It is important to understand that any filter has a limited resource. Even the most expensive system will stop working if the carbon cartridge becomes completely saturated. In models with automatic indication the system itself will remind you of the need for replacement, but in budget segments you need to remember this yourself.
How does a plasma purifier work?
The plasma generator creates a discharge that splits oxygen molecules, forming active ions. These ions attack the cell walls of bacteria and destroy the structure of odor molecules, turning them into harmless water and carbon dioxide.
The influence of the type of defrosting on air purity
The choice between No Frost and the drip defrosting system directly affects the presence of odors. In No Frost systems, the evaporator, where moisture and odors settle, is moved outside the food chamber. This means that the main source of mustiness is physically isolated from the products.
With each defrosting cycle, water from the evaporator flows into a special tray, taking with it accumulated contaminants. While in drip systems, moisture flows down the back wall inside the chamber, theoretically spreading bacteria, although modern drainage holes minimize this risk.
However, No Frost has its own nuances. Due to constant air circulation, odors from strong-smelling foods (such as fish or spices) can spread faster throughout the entire volume if they are not sealed. Therefore packaging tightness in such refrigerators is critically important.
Materials of the internal chambers and their properties
The material from which the internal chamber is made plays a key role. Cheap ABS plastic can turn yellow over time and absorb odors that are almost impossible to get rid of. Manufacturers are increasingly switching to materials with the addition of silver nanoparticles or copper.
Glass and metal in the decoration of shelves and drawers also contribute to hygiene. Glass shelves are easier to clean, they do not absorb fats and juices, unlike lattice plastic structures. Antibacterial coatings create an environment unsuitable for the life of microorganisms, which prevents the appearance of the primary source of odor.
When choosing, pay attention to the quality of the assembly of the joints. If there are gaps between the plastic panels, liquid and food debris can flow there. It is often impossible to clean such places without disassembling the case, and they become a constant source putrid odor.
Comparative table of cleaning technologies
To better navigate the variety of marketing names, let's consider the main technologies used by leading manufacturers to combat odors.
| Technology | Principle of operation | Efficiency | Necessity of replacement |
|---|---|---|---|
| Carbon filter | Adsorption of molecules odor | Average | Yes, every 6-12 months. |
| Silver ions (Ag+) | Suppression of bacterial growth | High | No (coating) |
| Plasma cleaning | Ionization and splitting | Very high | No (generator resource) |
| Photocatalysis | Oxidation under the influence of light | High | Yes, filter catalyst |
As can be seen from the table, the most effective are active systems (plasma, photocatalysis), which are not just mask the odor and destroy the cause of its appearance. Passive methods, such as charcoal, require regular maintenance.
Operation rules for maintaining freshness
Even the most advanced refrigerator with the No Frost system cannot remain fresh if you violate basic storage rules. Products must be packaged. Open pots of soup or a plate of fried fish without a lid are a guaranteed way to spoil the air in the entire chamber.
Regular inspection of the contents is another important point. A spoiled vegetable left in the bottom drawer will begin to rot and spread mold spores throughout the ventilation system. In models with freshness zone this process may be slower due to the low temperature, but it is inevitable.
- 🥫 Always cover food with a lid or cling film.
- 🧼 Wipe shelves and drawers with a solution soda or vinegar once a month.
- 🌡️ Monitor the temperature: at +4°C and above, bacteria multiply faster.
- 🥬 Separate raw meat and fish from prepared foods and vegetables.
Don't forget to check the drainage hole. If it is clogged, water will stagnate inside, creating ideal conditions for biofilm, which is very difficult to remove. biofilm, which is very difficult to remove.
☑️ Monthly freshness checklist
Folk methods and additional means
If the smell does appear, you should not immediately buy new equipment. Often the problem can be solved with simple methods. Activated carbon, brown bread, soda or special odor absorbers in the form of eggs do an excellent job of removing light odors.
However, if the odor is emitted by the plastic of the new equipment itself, this is a manufacturing defect or a feature of the material. In this case, the camera will be helped with a weak solution of citric acid and long-term ventilation with the doors open. washing chambers with a weak solution of citric acid and long-term ventilation with open doors.
⚠️ Attention: Do not try to paint over the internal plastic with paints or varnishes. This will violate the food approval of the materials and can lead to chemical poisoning of the products.
For complex cases, when the smell has ingrained itself into the seals, treatment with a steam generator (careful not to damage the plastic with high temperature) or special sprays to neutralize odors in refrigerators will help.
How often should you change the carbon filter?
The standard life of a carbon filter is from 6 to 12 months, depending on the intensity of use of the refrigerator. If you store a lot of products with strong odors, you should replace them more often - once every 4-5 months.
Is it possible to wash the deodorizer filter with water?
Ordinary carbon filters cannot be washed - water will wash away the activated layer or, conversely, clog the pores, making the filter useless. There are reusable filters that can be washed, but this should be indicated in the instructions for the specific model.
Why does a new refrigerator smell?
The smell of new plastic is normal. It is caused by the release of volatile compounds from materials. Before first use, a new refrigerator should be thoroughly washed and left with the doors open for 12-24 hours to air out.