{"id":997607,"date":"2026-10-02T08:00:00","date_gmt":"2026-10-02T06:00:00","guid":{"rendered":"https:\/\/kienzler-klima.de\/?p=997607"},"modified":"2026-08-19T11:24:48","modified_gmt":"2026-08-19T09:24:48","slug":"how-to-measure-air-distribution-quality-in-living-spaces","status":"publish","type":"post","link":"https:\/\/kienzler-klima.de\/en\/how-to-measure-air-distribution-quality-in-living-spaces\/","title":{"rendered":"How do you measure the quality of air distribution in living spaces?"},"content":{"rendered":"<div class=\"vgblk-rw-wrapper limit-wrapper\">\n<p>The quality of air distribution in living spaces can be objectively assessed using several measurable parameters: air velocity, temperature uniformity, CO\u2082 concentration, and draft-free conditions are the key metrics. For a complete evaluation, these values must be recorded at multiple points throughout the room and compared against recognized standards. The following sections explain which parameters are relevant, how measurements are carried out in practice, and what role the air distribution system plays in this process.<\/p>\n<h2>Which parameters describe the quality of air distribution?<\/h2>\n<p>The quality of air distribution in living spaces is described by four main parameters: air velocity, temperature uniformity, CO\u2082 concentration, and draft-free conditions. Together, these parameters indicate whether the room air is evenly distributed, whether pollutants are adequately removed, and whether occupants feel thermally comfortable in the space.<\/p>\n<p>No single value is sufficient to fully assess air distribution quality. A room may have a low CO\u2082 concentration yet still suffer from uneven temperature distribution or disruptive drafts. Only the interplay of all measurement parameters provides a reliable picture of actual indoor air quality.<\/p>\n<ul>\n<li><strong>Air velocity:<\/strong> Indicates the flow speed at which air reaches the occupied zone<\/li>\n<li><strong>Operative temperature \/ temperature uniformity:<\/strong> Describes how evenly warmth or coolness is distributed throughout the room<\/li>\n<li><strong>CO\u2082 concentration:<\/strong> Shows whether the fresh air supply is adequate and pollutants are being removed<\/li>\n<li><strong>Draft-free conditions (Draught Rating):<\/strong> Evaluates the subjective perception of drafts based on air velocity, temperature, and turbulence intensity<\/li>\n<\/ul>\n<h2>How are air velocity and draft-free conditions measured in a room?<\/h2>\n<p>Air velocity and draft-free conditions are measured using thermal anemometers or hot-wire anemometers, which can detect flow velocities down to 0.05 m\/s. Measurements are taken at several defined points within the occupied zone, typically at ankle, abdomen, and head height for both seated and standing occupants.<\/p>\n<p>For assessing draft-free conditions, measuring velocity alone is not sufficient. The so-called Draught Rating (DR) according to ISO 7730 combines three factors: mean air velocity, local air temperature, and turbulence intensity. This composite metric describes the percentage of room occupants who would perceive drafts as bothersome.<\/p>\n<p>In practice, the following guideline values apply to the occupied zone:<\/p>\n<ul>\n<li>Air velocity below 0.15 m\/s is considered draft-free and comfortable<\/li>\n<li>Velocities between 0.15 and 0.25 m\/s are tolerable, depending on temperature<\/li>\n<li>Above 0.25 m\/s, drafts are perceived as unpleasant by the majority of room occupants<\/li>\n<\/ul>\n<p>Areas near air outlets and exterior walls are particularly critical. Measurements in these locations should always be taken multiple times and under various operating conditions of the ventilation system to obtain reliable results. <a href=\"https:\/\/kienzler-klima.de\/en\/textile-air-ducts-basics\/\">Textile air distribution<\/a> can help prevent flow peaks from the outset.<\/p>\n<h2>How is temperature uniformity measured in living spaces?<\/h2>\n<p>Temperature uniformity in living spaces is determined through multi-point measurements using calibrated temperature sensors. Measurements are taken at a minimum of three height levels (0.1 m, 1.1 m, and 1.7 m above the floor) as well as at multiple horizontal positions in the room, in order to capture vertical and horizontal temperature gradients.<\/p>\n<p>A vertical temperature gradient of more than 3 Kelvin between ankle and head height is classified as a thermally uncomfortable indoor climate according to DIN EN ISO 7730. Horizontal temperature differences of more than 2 Kelvin between different areas of the room indicate inadequate air distribution.<\/p>\n<p>For meaningful measurements, it is advisable to record temperature values in both heating and cooling mode, as air distribution systems can produce different temperature profiles under different operating modes. Data loggers that measure continuously over several hours provide more reliable results than spot measurements.<\/p>\n<h2>What does CO\u2082 content reveal about air distribution?<\/h2>\n<p>The CO\u2082 content of indoor air is a direct indicator of fresh air supply and the efficiency of air exchange. If CO\u2082 concentration persistently exceeds 1,000 ppm, air renewal is insufficient. Values above 1,500 ppm signal a significantly poor indoor air quality that measurably impairs concentration and well-being.<\/p>\n<p>However, a low CO\u2082 value alone does not indicate uniform distribution of fresh air. It is possible that sufficient outdoor air is being introduced into a room, but that unfavorable airflow patterns cause short-circuit flows: the fresh air travels directly to the exhaust outlet without fully sweeping through the occupied zone. In this case, the average CO\u2082 value remains low, while the concentration in certain areas of the room may be significantly elevated.<\/p>\n<p>For a valid assessment, CO\u2082 sensors should therefore be placed at multiple positions throughout the room, particularly in areas with low air movement such as room corners or behind furniture. The difference between readings at various positions shows how uniformly the comfort ventilation is actually operating.<\/p>\n<h2>Which standards apply to the assessment of air distribution quality?<\/h2>\n<p>For assessing air distribution quality in living spaces, three standards are primarily relevant: DIN EN ISO 7730 for thermal comfort, DIN EN 16798 for the energy performance of buildings and indoor air systems, and DIN 1946-6 specifically for residential ventilation in Germany.<\/p>\n<h3>DIN EN ISO 7730: Thermal Comfort<\/h3>\n<p>This standard defines the criteria for thermal comfort and establishes limit values for air velocity, temperature gradients, and radiant asymmetry. It introduces the PMV\/PPD indices, which allow the predicted mean comfort perception and the proportion of dissatisfied occupants to be calculated. For living spaces, Category B or C is generally targeted.<\/p>\n<h3>DIN 1946-6: Ventilation of Dwellings<\/h3>\n<p>DIN 1946-6 governs the planning, execution, and commissioning of ventilation systems in residential buildings in Germany. It specifies minimum air change rates, outdoor air volume flows, and requirements for air distribution, and is mandatory for new buildings as well as energy-retrofitted structures. The standard distinguishes four ventilation levels ranging from minimum ventilation to intensive ventilation.<\/p>\n<h2>How does the air distribution system influence measurement results?<\/h2>\n<p>The air distribution system used has a decisive influence on all measurement results, as it determines the airflow pattern, the discharge velocity, and the uniformity of air distribution throughout the room. Conventional point diffusers generate high local flow velocities and can cause drafts, while area-based systems introduce air over a large surface area at low velocity.<\/p>\n<p>In <a href=\"https:\/\/kienzler-klima.de\/en\/can-be-used-in-all-areas-and-industries\/\">textile air distribution systems<\/a>, air exits uniformly along the entire length through the permeable surface of the fabric duct. The discharge velocity is well below the critical thresholds for draft perception, which is directly reflected in low Draught Rating values and uniform temperature profiles. This principle makes textile air outlets particularly suitable for spaces where people are present for extended periods.<\/p>\n<p>For measurement practice, this means: the choice of air distribution system establishes the framework conditions for all subsequent measurements. A well-designed system creates favorable airflow conditions from the outset, which are reflected in the measurement values. A poorly designed system can only be improved to a limited extent through subsequent modifications. Anyone planning an <a href=\"https:\/\/kienzler-klima.de\/en\/countless-variation-options\/\">air distribution system<\/a> should therefore opt early for systems that ensure uniform airflow in the living space from the very beginning.<\/p>\n<h2>How Kienzler Klima supports air distribution in living spaces<\/h2>\n<p>At Kienzler Klima, we develop and manufacture textile ventilation systems that are designed from the ground up for uniform air distribution. With more than 30 years of experience in air and climate technology and production exclusively in Germany, we deliver solutions that achieve measurably better results in practice than conventional sheet metal systems.<\/p>\n<p>What sets us apart:<\/p>\n<ul>\n<li><strong>Draft-free air distribution:<\/strong> Thanks to the permeable textile structure, air exits across the entire surface at very low velocity, enabling Draught Rating values well below comfort thresholds<\/li>\n<li><strong>Uniform temperature profiles:<\/strong> The area-based air introduction measurably reduces vertical and horizontal temperature gradients<\/li>\n<li><strong>Individual design:<\/strong> Every textile fabric duct is calculated and planned for the specific application, with an average production time of just 14 days<\/li>\n<li><strong>Savings of up to 60%:<\/strong> Compared to conventional sheet metal systems in terms of material and installation costs<\/li>\n<li><strong>Cradle-to-Cradle certification:<\/strong> For a sustainable solution across the entire product lifecycle<\/li>\n<\/ul>\n<p>If you would like to improve the air distribution quality in your living space or building, please get in touch with us. <a href=\"https:\/\/kienzler-klima.de\/en\/contact-us\/\">Contact us<\/a> and we will advise you on the right solutions for your project.<\/p>\n<\/div>\n<p><!-- .vgblk-rw-wrapper --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Air velocity, CO\u2082 levels, and temperature uniformity: here&#8217;s how to reliably measure air distribution quality in residential spaces.<\/p>\n","protected":false},"author":13,"featured_media":999580,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-997607","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unkategorisiert"],"acf":[],"_links":{"self":[{"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/posts\/997607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/comments?post=997607"}],"version-history":[{"count":1,"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/posts\/997607\/revisions"}],"predecessor-version":[{"id":997712,"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/posts\/997607\/revisions\/997712"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/media\/999580"}],"wp:attachment":[{"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/media?parent=997607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/categories?post=997607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kienzler-klima.de\/en\/wp-json\/wp\/v2\/tags?post=997607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}