Outdoor air and extract
Outdoor air enters in a controlled way and stale air is removed from suitable zones.
ANTAEngineering & Infrastructure
Distinguish cooling, renewal, filtration, dehumidification and air distribution.
This resource explains the principle, key decisions, common mistakes and the data required to go further.
A/01
Design principle
Data • Interfaces • Evidence
Air
Key points to retain.
Temperature is only one dimension of comfort and indoor air quality. Renewal, filtration, cooling, heating, humidity, distribution and extraction must be distinguished.
- A room air conditioner does not guarantee outdoor-air renewal.
- Too little airflow harms air quality; too much wastes energy and creates noise.
- Poorly maintained condensate drains and filters become problems themselves.
A/01Principle diagram — project-specific adaptation required
Guided reading
Understand the mechanism, then its consequences.
Filtration
Filters are selected according to pollutants, use and pressure loss.
Thermal and moisture treatment
Coils, direct expansion or other systems control temperature and humidity.
Supply and return
Jet geometry and grille position avoid dead zones, short circuits and draughts.
Prepare a study
Useful data before reaching a conclusion.
The visitor can begin with these items. ANTA will then determine which measurements and checks are really required.
- Maximum occupancy
- Pollutants and activities
- Airflow or duct data
- Temperature and humidity
- Maintenance history
Frequently asked questions
Clear answers without oversimplifying.
01Why does a room smell despite cooling?
Cooling may recirculate air without removing pollutants or bringing enough outdoor air.
02Should CO₂ be measured?
It can be a useful occupancy-related indicator when interpreted with occupancy and other pollutants.
03Why is there water below the unit?
Blocked drain, slope, insulation, tray, pump or surface condensation may be involved.
Essential glossary
Use the right words for the right decisions.
- Outdoor air
- Air introduced from outside.
- Extract
- Removal of indoor air.
- Condensate
- Water formed when moist air cools below its dew point.
- Balancing
- Adjustment of flows between branches and spaces.
Further reading
Institutional and technical sources.
ANTA content is an original synthesis. These references support verification and further study.
Turn a subject into a project