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Kitchen work triangle

The kitchen work triangle is a fundamental principle in kitchen design that arranges the three primary work centers—the sink for preparation and cleanup, the cooking surface (such as a stove or range), and the refrigerator for storage—into an efficient triangular layout to reduce unnecessary steps, streamline workflow, and enhance functionality for the cook.^[1] This concept aims to minimize the total distance traveled between these elements while avoiding obstructions, making it a cornerstone of ergonomic kitchen planning since its development in the early 20th century. Originating in the 1920s, the work triangle was pioneered by industrial engineer and psychologist Lillian Moller Gilbreth as part of her efforts to apply scientific management to homemaking tasks, transforming inefficient kitchen spaces into optimized environments modeled after industrial efficiency studies.^[2] Gilbreth introduced the idea at the Eighth Annual Exposition of Women's Arts and Industries in 1929, where she demonstrated a "work triangle" placing the sink at the apex, with the refrigerator and stove positioned nearby to facilitate smooth transitions between food storage, preparation, and cooking.^[3] Her approach emphasized reducing physical strain on the user, drawing from motion studies conducted with her husband, Frank Gilbreth, and was later refined by institutions like the University of Illinois School of Architecture in the 1940s to standardize kitchen construction and promote cost-effective, functional designs. In modern applications, the National Kitchen & Bath Association (NKBA) provides specific guidelines to implement the work triangle effectively: the sum of the three legs (measured from the center-front of each appliance or sink) should not exceed 26 feet (7.9 meters), with each individual leg ranging from a minimum of 4 feet (1.2 meters) to a maximum of 9 feet (2.7 meters) to balance proximity and accessibility.^[1] Additional recommendations include ensuring no major traffic paths cross the triangle, avoiding full-height obstacles that divide the centers, and limiting any intersection with islands or peninsulas to no more than 12 inches (305 mm) to maintain clear circulation.^[1] These standards, aligned with accessibility codes like the 2024 International Residential Code (IRC) and ICC A117.1-2017, ensure the triangle remains relevant in contemporary kitchens, adaptable to various layouts such as L-shaped, U-shaped, or galley configurations while accommodating evolving needs like universal design for aging-in-place.^[1]

Core Principles

Definition and Purpose

The kitchen work triangle is a foundational design principle in ergonomics that conceptualizes an imaginary line connecting the three primary work centers in a kitchen: the sink, the stove or oven, and the refrigerator. These points form a triangular path intended to optimize the spatial arrangement for seamless transitions between tasks. By linking these essential appliances, the triangle minimizes unnecessary steps and movements, creating a compact and intuitive workflow area.^[4]^[5] The core purpose of this design approach is to enhance operational efficiency in the kitchen, particularly for the primary activities of food storage (refrigerator), preparation and cleaning (sink), and cooking (stove or oven). It streamlines the process for a single cook by reducing physical exertion and the time spent traversing the space, thereby lowering fatigue during meal preparation. Additionally, the triangle promotes safety by isolating the main work zone from high-traffic paths, which helps prevent accidents such as collisions or spills in busy household environments.^[4]^[5] At its heart, the kitchen work triangle emphasizes a user-centered layout tailored to the needs of one individual in smaller or standard kitchen footprints, ensuring that core appliances remain accessible without excessive reaching or walking.^[4]^[5]

Key Components

The kitchen work triangle is formed by three essential work centers: the sink, the cooking surface (typically the stove or oven), and the refrigerator. These components are strategically linked to streamline the primary activities of food storage, preparation, and cooking, reducing physical effort and enhancing workflow efficiency.^[1] The sink, often designated as the cleanup and preparation sink, functions as the central hub for handling water-related tasks. It supports washing produce and utensils, soaking ingredients, filling cookware, and post-meal dishwashing, making it pivotal for hygiene and initial food processing stages.^[6]^[1] Proper positioning ensures easy access to running water, which is crucial for maintaining a sanitary environment during meal preparation.^[7] The stove or oven, serving as the primary cooking surface, is dedicated to heating, simmering, baking, and other thermal processes essential to meal creation. This component demands attention to heat management and fire safety, including adequate ventilation and non-combustible surroundings to prevent hazards while in use.^[1] It integrates seamlessly into the workflow by allowing direct transfer of prepared items from adjacent areas, supporting continuous cooking operations.^[6] The refrigerator acts as the key storage unit for perishable ingredients, preserving freshness through controlled cooling and enabling quick retrieval for immediate use in recipes. Its role emphasizes accessibility, particularly for frequently needed items like dairy, vegetables, and proteins, to avoid disrupting the preparation rhythm.^[7]^[1] Collectively, these elements interconnect via an unobstructed triangular path, forming a closed loop that promotes fluid task progression—such as moving from ingredient retrieval at the refrigerator to washing and chopping at the sink, then to heating at the stove—without interruptions from cabinets, islands, or traffic flow. This barrier-free design fosters a cohesive workflow, minimizing backtracking and supporting the triangle's overarching aim of operational efficiency.^[8]^[1]

Historical Development

Early Concepts

The early concepts of kitchen efficiency, which laid the groundwork for the work triangle, emerged from the broader industrial efficiency movements of the early 20th century, particularly through time-motion studies conducted by industrial engineers Frank and Lillian Gilbreth. In the 1910s and 1920s, the Gilbreths applied principles from scientific management—originally developed for factories—to domestic environments, analyzing repetitive tasks to minimize unnecessary movements and fatigue.^[9] Using techniques like multiple-exposure photography and breaking actions into basic units called "therbligs," they studied workflows in home settings, including food preparation, to optimize space and reduce physical strain on homemakers.^[10] This approach, influenced by Frederick Taylor's efficiency methods, shifted focus from industrial productivity to household labor, recognizing the kitchen as a primary site for daily work.^[11] Building on these ideas, research in the early 1920s specifically targeted the optimization of household tasks, predating the formal articulation of the work triangle. After Frank Gilbreth's death in 1924, Lillian Gilbreth intensified her efforts on domestic efficiency, publishing works like The Home-Maker and Her Job in 1927 that advocated for streamlined kitchen layouts to cut down on steps and motions during routine activities such as baking or meal preparation.^[11] Her studies quantified inefficiencies—for instance, redesigning a kitchen to reduce footfalls from 281 to just 45 for baking a cake—emphasizing compact, L-shaped configurations that positioned key work areas closer together without rigid measurements.^[10] These efforts highlighted the homemaker's role and promoted ergonomic adjustments to enhance overall home productivity.^[9] A pivotal demonstration of these concepts occurred in 1929, when Lillian Gilbreth unveiled the "Kitchen Practical" at the Women's Exposition of Arts and Industries in New York, sponsored by the Brooklyn Borough Gas Company. This model kitchen showcased an efficient, functional layout tailored for homemakers, incorporating motion-saving designs like strategically placed counters and appliances to facilitate smooth workflows.^[11] The exhibit emphasized compact arrangements suitable for everyday use, drawing from Gilbreth's decade of research to illustrate how such setups could alleviate the physical demands of domestic labor.^[10] These developments were driven by the context of post-World War I urbanization in the United States, which accelerated the growth of cities and led to smaller home sizes, necessitating more efficient domestic designs to accommodate limited spaces.^[11] As families transitioned from rural to urban living, the demand for practical, space-saving kitchen solutions grew, aligning with the era's progressive emphasis on scientific home management to support working households.^[12]

Post-War Standardization

Following the efficiency-focused ideas of the 1920s, the post-war era saw the formalization of kitchen design principles through rigorous academic research aimed at standardizing layouts for mass-produced homes. In the 1940s, the University of Illinois School of Architecture initiated comprehensive studies on kitchen efficiency, conducting lab-based experiments in mock kitchen setups to analyze homemaker movements and optimize appliance placement. These investigations, part of the Small Homes Council–Building Research Council's efforts, emphasized reducing steps taken during meal preparation in compact spaces typical of post-war housing.^[13] Key researcher Helen E. McCullough played a pivotal role in this work, contributing to empirical validations through detailed observations of task flows in simulated environments and publishing findings on storage and layout functionality. Her studies, often in collaboration with institutions like Cornell University, provided data-driven recommendations for counter space, storage proximity, and appliance arrangement to minimize fatigue and enhance productivity. This research directly informed the coining of the "work triangle" term around 1945–1950, describing the efficient triangular path connecting the sink, range, and refrigerator, with ideal side lengths of 4–9 feet and a total perimeter not exceeding 22 feet.^[14]^[13] The concept gained traction amid the post-World War II housing boom, as the United States constructed millions of new homes between 1945 and 1955 to support suburban expansion and accommodate returning veterans under the GI Bill. This rapid growth prioritized cost-effective, standardized designs, integrating the work triangle to streamline construction and ensure functional kitchens in affordable single-family dwellings. By the 1950s, the principle was widely adopted in architectural guidelines and building standards for American homes, promoting its use in federally influenced housing programs to elevate overall living efficiency.^[15]^[16]

Design Guidelines

Recommended Dimensions

The kitchen work triangle's effectiveness relies on precise spatial measurements between its three key components: the sink, stove, and refrigerator. Each leg of the triangle—representing the distance from sink to stove, stove to refrigerator, and refrigerator to sink—should ideally measure between 4 feet (1.2 meters) and 9 feet (2.7 meters). This range ensures that cooks can move efficiently without unnecessary steps, while providing enough space for safe operation around appliances.^[1] The total perimeter of the triangle, which is the sum of all three legs, should not exceed 26 feet (7.9 meters), with a practical minimum of approximately 12 feet (3.7 meters) based on the individual leg minimums. This overall limit prevents excessive walking distances that could reduce efficiency, while avoiding cramped configurations that hinder workflow. No single leg should exceed 9 feet to maintain proximity and minimize fatigue, and each must be at least 4 feet to allow adequate clearance for opening doors and handling items safely.^[1] To further support functionality, the work triangle must avoid intersections with major traffic paths, such as hallways or high-traffic zones, to prevent disruptions during food preparation. Additionally, sufficient clear counter space should adjoin each component; for example, at least 15 inches (381 mm) of landing area is recommended adjacent to the refrigerator on the handle side, 12 inches (305 mm) on one side and 15 inches (381 mm) on the other side of the stove, while the sink requires a minimum of 18 inches (457 mm) on one side and 24 inches (610 mm) on the other. These provisions ensure unobstructed areas for staging ingredients, utensils, and dishes.^[1]

Layout Considerations

The kitchen work triangle must be positioned to ensure unobstructed paths between the sink, refrigerator, and cooking surface, forming a continuous workflow without interruptions from structural elements or fixtures. According to National Kitchen & Bath Association (NKBA) guidelines (2025 5th edition), no major traffic patterns should cross through the triangle, and full-height obstacles such as tall cabinets should not separate the work centers.^[1]^[17] Islands or peninsulas may be incorporated but should not intersect any leg of the triangle by more than 12 inches (305 mm) to maintain clear circulation.^[1] Additionally, doors and windows must be placed to avoid interference with appliance operation or safe movement, such as ensuring entry doors do not encroach on the triangle's perimeter.^[1] Countertop integration is essential for supporting the triangle's efficiency, requiring dedicated landing spaces adjacent to each appliance to facilitate food preparation and handling. NKBA standards specify a minimum of 24 inches (610 mm) of countertop on one side of the sink and 18 inches (457 mm) on the other, 15 inches (381 mm) next to or opposite the refrigerator on the handle side, and 12 inches (305 mm) on one side of the cooking surface with 15 inches (381 mm) on the other.^[1] These spaces ensure seamless transitions during tasks like transferring ingredients from the refrigerator to the counter or from the sink to the stove, preventing bottlenecks in the workflow. Height and accessibility considerations focus on aligning the triangle with ergonomic standards to minimize strain during use. Standard countertop heights of 36 inches (914 mm) above the floor are recommended for the primary work level, accommodating most users while allowing for variations between 28 and 45 inches (711 mm to 1,143 mm) based on individual needs.^[1] Upper cabinets should be positioned to avoid blocking paths, with minimum work aisle widths of 48 to 54 inches (1,219 to 1,372 mm) for a single cook to provide adequate clearance for movement and appliance access (as of the 2025 NKBA guidelines).^[1]^[17] Common pitfalls in layout design include overly linear arrangements that stretch distances beyond efficient limits—such as aligning appliances in a straight line exceeding 9 feet (2.7 m) per leg—and incorporating large appliances that inadvertently increase separation between work centers.^[1] These issues can disrupt the triangle's core purpose, leading to inefficient navigation; designers should verify placements within the 4- to 9-foot guidelines per leg to mitigate such problems.^[1]

Applications in Kitchen Layouts

Traditional Layouts

The traditional kitchen layouts of the mid-20th century, popularized following the development of the work triangle concept by the University of Illinois School of Architecture in the 1940s, emphasized efficiency in compact, enclosed spaces designed primarily for one cook.^[16] These designs—galley, L-shaped, U-shaped, and G-shaped—position the sink, refrigerator, and cooking surface to form a triangular path with total perimeter distances ideally between 12 and 26 feet (3.7 to 7.9 meters), minimizing unnecessary movement while adhering to standard dimension guidelines.^[1] Each layout adapted the triangle to specific spatial constraints, maximizing functionality in postwar homes with limited square footage. The galley kitchen, also known as a straight-line or one-wall layout, arranges the three key elements along a single wall in a linear fashion, creating a compact work triangle ideal for small spaces under 100 square feet (9.3 square meters).^[18] This configuration, which gained widespread use in mid-20th-century urban apartments and narrow homes, offers high efficiency for sequential tasks but provides limited counter space, often requiring at least 42 inches (1.07 meters) of aisle width for one cook.^[1] Its simplicity suits tight footprints, though it can feel restrictive without additional parallel counters. In the L-shaped layout, the work triangle spans two adjacent walls, positioning the appliances at the ends and corner to facilitate moderate efficiency and better utilization of corner storage in medium-sized kitchens around 110 square feet (10.2 square meters).^[18] Popular in mid-20th-century suburban homes, this design promotes a natural workflow with no traffic interrupting the triangle, while providing more openness than fully enclosed options and accommodating casual dining at the corner.^[1] It balances accessibility and counter space effectively for everyday use. The U-shaped layout encloses the work triangle within three contiguous walls, maximizing storage and counter surfaces in spaces of about 100 to 120 square feet (9.3 to 11.1 square meters), a configuration that became a staple in mid-20th-century family kitchens for its comprehensive efficiency.^[18] By keeping the triangle free of obstacles and ensuring at least 60 inches (1.52 meters) between opposing arms, it supports seamless movement but may feel confined in smaller rooms due to the enclosed nature.^[1] The G-shaped layout extends the U-shape with a partial fourth wall or peninsula, enhancing flow and adding workspace while maintaining the core work triangle in the U section for medium kitchens exceeding 130 square feet (12.1 square meters).^[18] This mid-20th-century variation, often seen in homes seeking extra prep areas without full openness, improves overall efficiency by distributing tasks but requires careful peninsula placement to avoid disrupting the triangle's 4-to-9-foot (1.2-to-2.7-meter) leg lengths.^[1]

Modern Adaptations

In contemporary kitchen designs, the traditional work triangle has evolved to incorporate multiple triangles, particularly in larger spaces with islands or secondary preparation areas. This adaptation allows for auxiliary triangles dedicated to specific functions, such as a beverage center or wet bar on an island, where a secondary sink, mini-fridge, and countertop form an efficient sub-layout with distances of 4 to 9 feet between elements. According to the National Kitchen & Bath Association (NKBA), kitchens with more than three primary work centers should maintain additional travel distances of 4 to 9 feet to ensure workflow efficiency without disrupting the core triangle. This approach maximizes functionality in expansive layouts, such as those with central islands, by distributing tasks and reducing bottlenecks. As of the NKBA's 5th edition guidelines (2025), work zones are increasingly emphasized alongside or in place of multiple triangles for better accommodation of diverse needs.^[17] Open-plan kitchens, which combine cooking, dining, and living areas, require adaptations to integrate the work triangle seamlessly while promoting social interaction. Designers use partial barriers like peninsulas or zoning techniques to shield the core triangle from high-traffic paths, ensuring no major circulation routes cross the primary work areas. The NKBA emphasizes that this preserves the triangle's efficiency in fluid, multi-functional spaces. For instance, in living-dining-kitchen combinations, the triangle is positioned toward the back of the kitchen to allow unobstructed views and flow, evolving from more enclosed traditional designs like galley or L-shaped layouts. To accommodate multiple cooks, modern guidelines expand the work triangle's parameters, recommending aisle widths of 48 to 54 inches to prevent congestion and allow simultaneous activity.^[17] Distances between elements remain within 4 to 9 feet, with provisions for dual sinks or stoves to create parallel workflows. The NKBA supports this by advising clearances that facilitate shared use, while experts note that incorporating multiple triangles—such as one for prep and another for cooking—enables collaborative meal preparation without overlap. Technological advancements and sustainability concerns have further influenced the work triangle by integrating smart appliances and energy-efficient placements. Built-in refrigerators and induction cooktops, for example, are positioned within the triangle to minimize steps while supporting connectivity features like app-controlled operations. Sustainable adaptations prioritize eco-friendly fixtures, such as low-flow sinks and energy-star appliances, arranged to optimize natural light and ventilation for reduced energy use. The NKBA's landing area requirements—15 inches adjacent to refrigerators and 12 to 15 inches near cooking surfaces—aid in incorporating these elements without compromising efficiency. Recent 2025 trends highlight multifunctional appliances and personalized zoning to enhance sustainability and user-specific efficiency in these designs.^[19]

Kitchen Zoning

Kitchen zoning extends the traditional work triangle by dividing the kitchen into distinct functional areas, allowing for more efficient task organization in larger or multi-user spaces. This approach builds on the core principle of minimizing unnecessary movement while accommodating diverse activities beyond basic food preparation.^[20] The primary zones consist of four key areas: the cleaning zone centered around the sink for washing and dish handling; the cooking zone near the stove for meal preparation involving heat; the storage zone encompassing the refrigerator and pantry for easy access to ingredients; and the preparation zone at the central counter for chopping, mixing, and assembly. Each of these zones is designed to support specific workflows, ensuring that essential tasks occur in proximity to relevant appliances.^[1]^[20] Secondary zones, such as baking, serving, and recycling, are positioned adjacent to the primary areas to maintain a logical sequence of activities. For instance, a baking zone might include dedicated storage for flour and tools near the preparation area, while a serving zone facilitates plating and transfer to dining spaces, and a recycling zone handles waste disposal close to the cleaning area. These additions enhance flexibility without disrupting the overall flow.^[21]^[20] Central to zoning principles is the idea that each area should be self-contained, with necessary tools and appliances stored nearby to minimize steps and effort. This setup reduces cross-traffic by directing movement along efficient paths, such as placing dirty preparation tasks near the sink and clean serving items toward the dining area, thereby preventing congestion in high-activity zones.^[1]^[21] Zones integrate with the work triangle by radiating outward from its central elements—the sink, stove, and refrigerator—while avoiding overlap in primary pathways to preserve unobstructed access. This layered structure allows the triangle to serve as the kitchen's core, with surrounding zones supporting extended functionality in contemporary designs.^[20]^[21]

Efficiency and Ergonomics

The kitchen work triangle enhances efficiency by minimizing unnecessary movement between key work areas, thereby reducing the physical effort required for common tasks such as meal preparation. Early time-motion studies, including those by efficiency experts Frank and Lillian Gilbreth, demonstrated that optimized layouts like the L-shaped kitchen could slash the number of steps needed for routine activities from 281 to just 45, representing a substantial decrease in overall travel distance.^[22] In modern applications, adherence to the triangle principle in layouts such as U-shaped kitchens has been shown to cut cooking time by up to 30% through strategic placement of the sink, stove, and refrigerator within 4 to 9 feet of each other.^[23] This reduction in steps and time not only boosts productivity but also lowers the risk of fatigue during extended use. From an ergonomic standpoint, the work triangle promotes user health by aligning work zones with natural body mechanics, thereby reducing strain on the back and joints. Optimal countertop heights, typically set 10 to 15 centimeters below elbow level (around 34 to 36 inches for standard users), allow for comfortable reaching and preparation without excessive bending or stretching, which can prevent long-term musculoskeletal issues.^[24] Safety is further improved by isolating hazards—such as hot cooking surfaces—from high-traffic paths, minimizing collision risks and burns, as recommended in industry standards that prohibit major traffic flow through the triangle area.^[1] For accessibility, the design aligns with ADA guidelines by incorporating knee clearances under sinks and counters (at least 27 inches high and 30 inches wide) and ensuring clear paths of at least 36 inches, enabling wheelchair users to navigate the triangle effectively.^[1]^[25] Considerations for handedness influence flow direction, with right-handed users benefiting from a clockwise triangle (sink to stove to refrigerator) to support dominant-hand actions, while adjustable features like pull-out shelves and drawers enhance reach for all users without altering the core layout.^[26] Despite these advantages, the work triangle faces criticisms for its limitations in contemporary settings, particularly in households with multiple cooks or those prioritizing social interaction. The traditional model, designed primarily for single-user efficiency, can become cramped and inefficient when two or more people prepare meals simultaneously, leading to overlapping paths and reduced collaboration.^[27] In larger or open-plan kitchens—trending since the 1980s toward integrated living spaces—the rigid triangle may feel restrictive, failing to accommodate entertainment zones or auxiliary appliances like secondary sinks.^[28] Recent research highlights these shortcomings, with 21st-century design studies advocating hybrid models that incorporate multiple triangles or zoning to improve efficiency in meal prep while adapting to diverse family dynamics.^[29]

References

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[PDF] Kitchen Planning Guidelines with Access Standards - NKBA
The distances between the three primary work centers. (cooking surface, cleanup/prep sink, and refrigeration storage) form a work triangle. Code Requirement:.
[2]
Lillian Gilbreth's Scientific Management of Homemakers, 1924-1930
Gilbreth's approach to 'engineering in the home."'44 Her "circular work place" was transformed into a "work triangle" (linking centers for storage, cleaning/.
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At the 1929 Women's Exposition, Lillian Gilbreth, an engineer and psychologist, introduced the concept of the “work triangle” which guides kitchen design today.
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Oct 1, 1993 · Work triangle. The work triangle concept can give you a basis to see how well your space planning will facilitate your work in the kitchen.
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Nowadays, the concept of work triangle is used as a guideline of kitchen designs and aims to plan out efficient kitchen workspaces with minimal traffic through ...
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The kitchen work triangle is a design concept that focuses on a kitchen's three main work areas. These key components are strategically positioned.
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This principle involves arranging three critical kitchen elements—the sink, the refrigerator and the stove—in a triangular formation. Ideally, each side of the ...
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Use your house plans in scoring your kitchen. The plan above shows how cabinet frontage is obtained. Draw in the work triangle (distances between appliances) t~.
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Feb 15, 2018 · According to its tenets, each leg of the triangle formed should be between four and nine feet each, and the sum distance of the triangle should ...
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Sep 26, 2025 · The mid-20th century saw popularization of the "work triangle" concept, emphasizing efficiency between the stove, sink, and refrigerator. As ...U-Shape Kitchen · U-Shape Island Kitchen · L-Shape Kitchen · Kitchen Sinks<|control11|><|separator|>
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Sep 23, 2019 · The kitchen work triangle is a 90-year-old concept that dictates the placement of the sink, cooktop, and refrigerator.
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By sectioning off your kitchen into work zones, you'll maximize efficiency in a larger space; more cooks, as well as their guests, will be better accommodated.
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Sep 8, 2025 · The kitchen work triangle forms the heart of your U-shaped kitchen layout. Smart placement of your sink, stove, and refrigerator creates an ...
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The optimal working height for you is this distance minus 10 to 15 centimetres. Of course, there are also average values for the working height in the kitchen.
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