Ventilation and extration

Which primary purpose of building ventilation directly supports human respiration?

• Maximizing air stagnation in rooms

• Trapping heat within occupied spaces

• Maintaining adequate oxygen concentration indoors

• Increasing indoor carbon dioxide generation

Which combination best represents air-quality control functions of ventilation?

• Increase indoor humidity

• Limit carbon dioxide accumulation

• Introduce stagnant air

• Remove odours and smoke

• Control moisture content

A poorly ventilated room feels stuffy and warm after a meeting. What ventilation outcomes would address this most directly?

• Preserve correct oxygen levels

• Increase carbon dioxide concentration

• Remove stagnant air from the space

• Add moisture to the indoor air

• Remove excess heat from the room

Which statement best distinguishes natural from mechanical ventilation in a building-services context?

• Natural relies on wind and buoyancy forces

• Both rely solely on internal heat gains

• Mechanical depends exclusively on window openings

• Both avoid controlling pollutants and moisture

Which of the following is NOT a typical objective of building ventilation?

• Dispose of dust and odours from spaces

• Control indoor moisture to prevent issues

• Retain excess heat to save winter energy

• Maintain appropriate oxygen for occupants

Which statement best describes the wind effect in natural ventilation?

• Mechanical ducts extract stale indoor air

• Indoor fans push air through rooms

• Warm air sinks and cold air rises indoors

• Natural external air currents drive airflow

In buildings relying on the stack effect, what primarily causes air movement?

• Operation of extraction fans in kitchens

• Temperature difference causing buoyant warm air

• Balanced supply and extract airflow rates

• Pressure from external wind turbulence

Which of the following are types of mechanical ventilation systems?

• Extraction systems used in kitchens and toilets

• Wind-driven openings without fans

• Supply systems moving outdoor air indoors

• Balanced systems with matched supply and extract

A facility manager wants airflow without fans. Which approach fits this requirement?

• Increase powered supply fan capacity

• Use wind effect through external air currents

• Install balanced mechanical fan systems

• Add extraction fans near heat sources

Which principle primarily drives single-sided natural ventilation in a room with one façade openable elements?

• Humidity gradients pulling moisture outward

• Mechanical fans inducing negative pressure

• Stack effect displacing warm indoor air

• Crossflow pressure between two façades