What is a Filter?

A filter is a device or component designed to remove particulate matter, contaminants, or impurities from air (or other fluids) within a ventilation system. In the context of UK residential building, retrofits, and extensions, filters are commonly integrated into whole-house ventilation systems (such as Mechanical Ventilation with Heat Recovery, MVHR) and kitchen extractor fans to improve indoor air quality (IAQ) by capturing dust, pollen, and cooking fumes.

Context & Application

  • Whole-House Ventilation (MVHR/MEV): Filters in MVHR systems prevent outdoor pollutants (e.g., PM2.5, pollen) from entering while also trapping indoor particulates before air is exhausted.
  • Kitchen Extractor Fans: Grease and carbon filters are often used to reduce odours and airborne grease particles, complying with Part F (Ventilation) of the Building Regulations (2021 edition).
  • Retrofit Considerations: When upgrading ventilation in older homes, filters must be selected based on efficiency (MERV or F7+ ratings) and maintenance requirements.

Synonyms

  • Air filter
  • Particulate filter
  • Pollen filter (in MVHR systems)

Related Terms

  1. Mechanical Ventilation with Heat Recovery (MVHR) – A system that extracts stale air, recovers heat, and supplies filtered fresh air.
  2. Part F (Ventilation) – Building Regulations – Mandates minimum ventilation rates and filter efficiency for new builds and retrofits.
  3. Indoor Air Quality (IAQ) – The measure of air cleanliness, influenced by filtration.
  4. Particulate Matter (PM2.5/PM10) – Airborne particles targeted by filters.