THE INTERIOR IN SCHOOL BUILDINGS. DIMENSIONS AND SCALES OF THE ELEMENTS OF INTERIOR REQUIREMENTS FOR ELEMENTS OF THE INTERIOR SPACE

Ergonomic requirements for furniture are defined. Dependency between the physiological characteristics of children and the size of furniture and spaces are followed up in the article. The main trends for design of classroom furniture are provided. Materials required to create furniture for particular age groups of students are indicated. Materials for finishing layers of the enclosing elements have been identified, specifying their characteristics and when these are the most apprpriate to achieve a better learning environment. KEYWORDS

The concept of physical development synthesises on the one hand the growth or the quantitative increase of the basic dimensions of the body characteristic of the full-term newborn baby and, on the other hand, the development or maturationthe appearance and changes of the physical parameters that the child's organism should acquire at a certain age. The growth rate and parameters that the body reaches in a particular age group are the basis of the design and production of furniture for school buildings interior. To be comfortable it should be ergonomic.
The term ergonomics comes from the Greek words ergon (work) and nomos (rule) and means science of human work/labour. Ergonomics is a science that studies the compliance of the environment with the human body and the reduction of fatigue and discomfort by designing such products. When it comes to furniture design, it has to be taken into account whether the designed products correspond to the needs of the people who use them. Whether at work, at school or at home, when products are user-friendly, the result is more comfort, higher productivity and less stress.
Interaction of human body with the tools of labour and furniture is of a key importance. When working at a desk, the main concern is for ergonomic sitting position, which is the physiologically optimal position that is not overtax and thus increases concentration and prevents back pain and headaches.
Principles of ergonomic sitting.
1. There is no such thing as proper and wrong sitting. The only important thing is changing the posture frequently. So do not correct the posture of your child when he/she is taking a strange position on the chair.
2. The desk and chair should "fit" like a glove on the one who sits there. In order to achieve a healthy sitting position, the working environment of the child should be compatible to his/her height and proportions. Adjustment starts with the chair, the second step is the height of the desk.
3. The height of the chair should be chosen so that the front edge of the seat is approximately at the level of the rear of the knee. The height of the seat is correct when the angle between the hip and the body is slightly above 90° and the feet are firmly on the floor. Tilting the seat forward encourages the child to sit upright and concentrate while working at the desk. The pelvis is slightly tilted forward and the back is upright. The removable seat supports dynamic sitting position. 4. The depth of the seat may be adjusted so that the hips rest on the front edge without tension. The distance between the front edge of the seat and the calf of the leg should be about 4 fingers. This ensures the free passage of blood through the legs.
5. The seat must be at such a height as to support the body from the pelvis to the shoulder blades. Thus, when leaning back pressure is released from the back. 6. In order to adjust the height of the desk, put your hands on top. The position is correct when the elbow angle is slightly above 90 o .
7. The lower part of the arms should be resting while working. This is how the muscles of the neck rest. When designing furniture it is very important to know that for different countries the parameters and dimensions of the human body are different.
Anthropometry is a science that measures the physical dimensions of a population. When products are designed, it is important to keep in mind that the human body has different sizes and shapes. Anthropometric data vary considerably between the populations of different countries.
Based on experience and numerous studies, conclusions have been drawn about the size and type of seating furniture required in different classrooms.
• Types of furniture in the classroom For each classroom, regardless of the age group of students, the following furniture may be listed: -Seating furniturechairs for students, chair for the teacher; -Tables and worktopstables for students, worktops on the periphery, table for the teacher; -Storage furnitureframe furniturethis group includes all types of bookcases, shelves, sectional furniture, cabinets, etc.; -"Black" boardin modern school it is very often replaced by an interactive board, projection screen, or greenboard, but its main function is preserved, and so is its place.
Students' table and chairs should be considered together. In a classroom, desks are often used as a combination of a chair and table. Desks are intended for two students or there are one-seat desks for one student. Nowadays, desks are increasingly giving place to tables. Tables may also be intended for two or one student.
• Furniture dimensioning One of the most accurate studies of the ratio between furniture dimensions and students' size according to their age was made by Prof. Ernst Neufert.    students  56  60  66  71  74  76  78  78  h-total  height  45  50  50  55  55  55  60  60  B-width  36  40  42  44  46  46  48  48  s-height  of  the  seat from  the floor  33х35  35х38  35х38  37х40  37х40  40х43  40х43  40х43 Size of the seat The ratio between the student's height and classroom furniture is very important so that the student may study comfortably. Comfortable sitting reduces fatigue. Good furniture, suitably chosen for different age groups, helps in the formation of good posture and reduction of spinal deformities in children. It should be known that students spend most of the day at school.
• Materials for making furniture Different groups of students use different size of furniture and often the material from which they are made is different.
Physiology and emotional state of children, striving for ergonomics and absolute comfort and safety are the leading factors in choosing the material. It is very important that the furniture is resistant to mechanical stress. Table 4. Types of furniture for primary, secondary and high education classes /Photos published on the Internet/

Furniture Material for primary education classes
Material for secondary and high education classes Table  and chair  or desk Plasticeasy maintenance, durable, lightweight, variety of colours and models. A very good option for the youngest students.
Plastic furniture is safe, which makes them preferred furniture. They are very light and the children can move and arrange them. Wood /solid wood, layered wood, pressed chipboard, medium density fiberboard/ -gives warmth and coziness. Robust, durable, with a choice of colours. Most often, the natural colour of wood is used.
Plasticnot commonly used material in its pure form, i.e. if not combined with metal or wood. Various plastic materials are used for new conceptual models of multifunctional furniture.
Wood /solid wood, layered wood, pressed chipboard, medium density fiberboard (MDF)/ -less frequently used in its pure form, i.e. if not combined with metal or wood. Most often the chair is made entirely of wood and the table is combined with metal.

№ 6(46), Vol.1, June 2019
Combination of metal and woodthe best and most common combination. It has the strength of metal and the wood processing option.
Combination of metal and plasticincreasingly replacing wood. Great colour variety, lightweight and durability. Brighter colours are selected.
It is most commonly used for bookcases, shelves and racks. Combination of metal and woodthe best and most common combination. Both the chair and table are combined with metal housing.
Combination of metal and woodincreasingly replacing wood. Due to the larger size of the students, a higher strength of furniture is required; therefore, it is not relied on metal as supporting element.
In this version, unlike the previous one, furniture is lighter, much more resistant to mechanical and atmospheric influences, easy to maintain and operate, and much cheaper.

Storage furniture frame furniture
Plasticeasy to maintain, durable, lightweight, with great variety of colours and models. These are rarely manufactured because of the larger size of the furniture.
Woodgives warmth and coziness. Easy and fast installation. Solid wood, layered wood, most often pressed chipboard and MDF panels may be used. The furniture is comfortable for use, safe and resistant to mechanical and atmospheric influences.
Plasticvery rarely used. Most often, for boxes to store objects. Woodcommonly used material for any framework furniturewith open shelves and bookcases or with closed sections. Solid wood, layered wood, most often pressed chipboard and MDF panels may be used.
Metal and wood combinationthe best and most common combination. Very often the wood is dyed or stained in a suitable color. Open furniture of high strength and durability is thus created.
Metal and plastic combinationmetal structure and plastic housings, or shelves, drawers, boxes.
Wood and plastic combinationwide variety of options. Wooden base with plastic housing.

Metal and wood combinationthe best and most common combination.
The strength of the metal construction and the lightweight wood is used, which results in coziness and comfort. Metal and plastic combinationlightweight furniture with high mobility.
Wood and plastic combinationcombination of solid wood or wooden frames and plastic shelves, boxes and drawers. № 6(46), Vol.1, June 2019 Metalcabinets are often made of metal only. Metal structure and sheet metal.
Very often metal cabinets are used for lockers and storage cabinets in chemistry and biology rooms due to their strength and resistance to mechanical damage.
Metalcabinets are often made of metal only metal structure and sheet metal. Outside the classroom, cabinets for storing hazardous chemical elements are used in rooms for practical classes in chemistry, cabinets for equipmentin rooms for practical classes in physics, cabinets for exhibitsfor practical classes in biology. A good option for sports areaschanging rooms and warehouses. Also, for racks in libraries.

• New ideas for mobility and multifunctionality of furniture
In view of the modern way of teaching and the pursuit of working in groups in order to enhance the communicativeness of children, development of logical thinking, the stationary places and tables well-ordered in rows are outdated. Classroom furnishing should seek the possiblity for mobility and various grouping of furniture. Designers are looking for the opportunity to design a unit of furniture /table + chair/ to fit perfectly to every student, to be comfortable for writing and sitting, to have enough space for his/her personal effects.  /Photos published on the Internet/ All principles of ergonomics based on standards related to the size of children in the initial age groups are applicable, but here is an opportunity for more freedom in the design of classroom furniture. It is relied on mobile, light, one-seat furniture /desks/ or a chair and table for two, which may be easily grouped into interesting combinations. It is always emphasized on colourful solutions, robust materials and rounded edges of the finished product to make it as safe as possible. Many companies and designers from around the world are working to create the most comfortable, light and durable furniture for multifunctional use. In the primary education classroom there may be different areas to be furnished differently. The learning area may be furnished with desks, the practical activity area may be furnished with tables for group work, the listening and conversation area may have soft pillows on the floor. The furniture may include one item /table with a chair/, which is suitably related and combined with others to obtain different options in the different zones.
Multifunctional furniture is increasingly being introduced in the school buildings interior. These are light, comfortable, with many application options. Designers are seeking for more compact furniture to store various items and take less space. The main objective is to find a way to facilitate the work of students and teachers, and to allow for different combinations of furniture for work in two or in groups. This changes and diversifies the learning process and increases the interest and strengthens students' attention. To achieve multiple combinations, furniture should be light and allow for variations in the arrangement, and finally yet importantly, it should not take too much space, which should not be at the expense of convenience and comfort.

Matali Crasset
Design Mariu Goetzz -Design SPOTTER Fig.7. Examples of multifunctional furniture /Photos published on the Internet/ A great advantage in designing tables and chairs for schools is the possibility of changing the size of individual furniture. Children of the same age often have different size beyond standards, they are higher or overweight. It will be very good for them if they may adjust the chair and table in order to feel as comfortable as possible. At best, the table and chair should allow for changing all parameters: height, seat angle, backrest angle, working plane angle, etc.
• Furniture concepts Many designers work with the desire to design the most comfortable and functional school furniture. This is how many conceptual furniture models of the future are created.

Maciek Wojcicki Design
Flux e-desk Behance Design pcStudio Design Fig.11. Conceptual models for school furniture /Photos published on the Internet/