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Sistemas de extracción de aire ¿Qué son?

Sistemas de extracción de aire ¿Qué son?

Hay contaminantes que no se ven, no se huelen o simplemente se normalizan con el tiempo. Polvo en suspensión, vapores químicos, humos de cocina, partículas metálicas, gases de combustión… En muchos entornos industriales y de hostelería, el aire interior puede ser significativamente más nocivo que el exterior. Y eso tiene consecuencias: para la salud de las personas, para la normativa vigente y para la eficiencia de los propios procesos.

Un sistema de extracción de aire es la respuesta técnica a ese problema. No se trata de ventilar por ventilar, sino de gestionar el aire de forma activa, eficiente y segura.

¿Qué es un sistema de extracción de aire?

Un sistema de extracción de aire es un conjunto de equipos y elementos que trabajan coordinadamente para capturar, filtrar y expulsar al exterior el aire viciado, los contaminantes en suspensión y los gases nocivos generados en un espacio interior. A diferencia de la ventilación natural —que depende de corrientes de aire y condiciones externas—, un sistema de ventilación y extracción de aire funciona de forma controlada, garantizando resultados constantes independientemente del contexto.

Su función principal es triple: proteger la salud de las personas que trabajan en el espacio, cumplir con la normativa de seguridad e higiene industrial, y preservar la maquinaria y las instalaciones del deterioro prematuro causado por partículas y humedad.

Cuándo es necesario utilizar un sistema de extracción de aire

No todos los espacios requieren el mismo nivel de extracción, pero hay entornos donde su instalación no es opcional, sino obligatoria. Entre los casos más habituales con los que trabaja Grupo SASTI destacan:

  • Talleres de mecánicos, soldadura o tratamiento de metales, donde se generan humos y partículas metálicas en suspensión.
  • Industrias textiles, donde el polvo de fibra acumulado representa tanto un riesgo para la salud como un peligro de incendio.
  • Plantas de transformación de plásticos o industria química, con emisiones de vapores y gases volátiles.
  • Cocinas industriales en restaurantes y hostelería, donde la extracción de humos y grasas es obligatoria por normativa.
  • Garajes y parkings, donde los gases de combustión de los vehículos requieren sistemas específicos de renovación de aire.
  • Instalaciones de reciclaje o tratamiento de residuos, con alta concentración de polvo y partículas orgánicas.

La señal de que un espacio necesita intervención suele ser evidente: olor persistente, visibilidad reducida por humos o polvo, trabajadores con irritaciones respiratorias o simplemente el incumplimiento de los valores límite de exposición profesional (VLE) establecidos por el INSST.

Beneficios de instalar un sistema de extracción de aire

Más allá del cumplimiento normativo, un sistema correctamente diseñado e instalado aporta ventajas tangibles tanto para la empresa como para las personas.

Sistema 2

Mejora de la calidad del aire

Reducir la concentración de partículas en suspensión, gases y compuestos orgánicos volátiles (COV) tiene un impacto directo en la salud respiratoria de los trabajadores. Menos absentismo, menor riesgo de enfermedades profesionales y mejor rendimiento en el puesto de trabajo. No es un beneficio intangible: tiene traducción económica.

Cumplimiento normativo 

La normativa española y europea —desde el RD 486/1997 sobre lugares de trabajo hasta las directivas ATEX para atmósferas explosivas— exige condiciones específicas de ventilación en función del tipo de actividad. Un sistema de extracción de aire industrial adecuado no solo protege a las personas: también protege a la empresa frente a inspecciones, sanciones y responsabilidades en caso de accidente.

Mayor vida útil de equipos

El polvo, la humedad y los vapores corrosivos son enemigos silenciosos de la maquinaria. Un entorno con aire controlado reduce significativamente el desgaste de componentes electrónicos, mecánicos y neumáticos. Dicho de otra manera: invertir en extracción es también invertir en mantenimiento preventivo de toda la planta.

Tipos de sistemas de extracción de aire

No existe un sistema único válido para todos los casos. La elección correcta depende del tipo de contaminante, el volumen del espacio, las características de la actividad y la normativa aplicable.

Según el método de extracción 

Extracción localizada (LEV): capta el contaminante en el punto exacto de generación, antes de que se disperse por el ambiente. Es la solución más eficiente en términos de caudal necesario y la más recomendable cuando la fuente de emisión está definida y estable (soldadura, mecanizado, aplicación de pinturas).

Ventilación general dilucional: renueva el aire de todo el espacio mezclando el aire contaminado con aire limpio hasta reducir la concentración por debajo de los niveles de riesgo. Adecuada para contaminantes de baja toxicidad y espacios donde la fuente no es puntual.

Sistemas de presión diferencial: utilizados en áreas que requieren control estricto de la contaminación cruzada, como laboratorios, salas blancas o áreas de envasado alimentario. Mantienen presiones positivas o negativas respecto a los espacios adyacentes.

Según el espacio a ventilar

El espacio condiciona tanto el diseño de la red de conductos como la potencia y tipología de los ventiladores:

Sistema de extracción de aire industrial: diseñado para naves, plantas de producción y talleres de gran volumen, con caudales elevados y filtración adaptada al tipo de industria (ciclónico, de mangas, electrostático…).

Extracción en hostelería: orientada a cocinas profesionales, con campanas extractoras, filtros de grasa, conductos de acero inoxidable y salida al exterior cumpliendo la normativa municipal y de prevención de incendios.

Extracción en garajes y aparcamientos: con detectores de CO que activan automáticamente los extractores cuando se supera el umbral de seguridad, cumpliendo el CTE DB-HS3.

Cómo funciona un sistema de ventilación y extracción de aire

Entender el funcionamiento básico ayuda a tomar mejores decisiones, tanto en la fase de diseño como en el mantenimiento posterior.

Principios básicos de funcionamiento

Todo sistema de extracción se basa en crear una diferencia de presión que mueve el aire desde el interior hacia el exterior. El ventilador o turbina genera ese diferencial; la red de conductos dirige el flujo hacia los puntos de captación y hacia la salida; y los elementos filtrantes retienen los contaminantes antes de que el aire sea expulsado o recirculado.

El caudal necesario (medido en m³/h) se calcula en función del volumen del espacio, la tasa de renovaciones por hora requerida y la toxicidad o carga de contaminante del proceso. Un cálculo incorrecto lleva a sistemas sobredimensionados (con consumo energético innecesario) o subdimensionados (con riesgo para la salud y el cumplimiento normativo).

Componentes principales

  • Captadores o campanas de extracción: recogen el aire contaminado en la fuente. Su geometría y posición son críticas para maximizar la eficiencia de captura.
  • Red de conductos: transporta el aire desde los puntos de captación hasta el sistema de filtración y la salida al exterior. Deben estar correctamente dimensionados para minimizar pérdidas de carga.
  • Sistema de filtración: retiene partículas, vapores o gases según el tipo de contaminante. Puede incluir prefiltros, filtros de mangas, filtros HEPA, carbón activo o sistemas electrostáticos.
  • Ventilador o turbina: motor del sistema. Su selección en términos de presión estática, caudal y nivel sonoro determina en buena medida el rendimiento global.
  • Automatización y control: sensores de calidad del aire, variadores de frecuencia y sistemas de monitorización permiten adaptar el funcionamiento a las condiciones reales, reduciendo el consumo y anticipando averías.

Cómo elegir el sistema de extracción de aire acondicionado | Grupo SASTI

Aquí es donde la teoría se convierte en ingeniería aplicada. Elegir bien un sistema de extracción de aire no consiste en seleccionar el modelo más potente del catálogo ni en replicar lo que tiene la empresa de al lado. Consiste en analizar el proceso, entender la naturaleza del contaminante, medir el espacio y diseñar una solución que resuelva el problema concreto de forma eficiente, duradera y conforme a normativa.

En Grupo SASTI llevamos más de 25 años trabajando en esto, con especialización en los sectores industrial y hostelero. Nuestro proceso parte siempre de una visita técnica para evaluar el entorno real: tipo de actividad, dimensiones, contaminantes presentes, normativa aplicable y condiciones de uso. A partir de ahí, diseñamos e instalamos el sistema, y lo acompañamos con un plan de mantenimiento preventivo que garantiza su rendimiento en el tiempo.

Algunos factores clave que siempre analizamos antes de recomendar un sistema:

  1. Tipo y concentración del contaminante: no es lo mismo polvo de madera que vapores de disolvente.
  2. Volumen y geometría del espacio: una nave con obstrucciones requiere una red de conductos diferente a un espacio diáfano.
  3. Continuidad del proceso: si la actividad genera contaminantes de forma intermitente, un sistema con variador de frecuencia puede reducir el consumo hasta un 50%.
  4. Normativa sectorial aplicable: ATEX, CTE, normativa municipal de hostelería, valores límite INSST…
  5. Posibilidades de salida al exterior: o necesidad de recirculación con filtración de alta eficiencia.

Un sistema de extracción de aire bien diseñado no es un gasto: es una inversión que se amortiza en salud, productividad, cumplimiento y durabilidad de las instalaciones. Si tienes dudas sobre qué solución necesita tu espacio, en Grupo SASTI podemos ayudarte a encontrarla.