What are the five comfort zone requirements?

• A. Circulation, Filtration, Humidity, Ventilation, Temperature
• B. Circulation, Humidity, Temperature
• C. Filtration, Humidity, Ventilation
• D. Circulation, Filtration, Humidity, Ventilation

Answer: (A)

Indoor comfort depends on five environmental factors: temperature, humidity, air circulation, ventilation, and filtration. Temperature and humidity influence how the body senses warmth and moisture removal. Good air circulation keeps air moving so heat and moisture don’t stagnate near you. Ventilation brings in fresh outdoor air and vents out indoor air, helping control contaminants and odors. Filtration cleans the air, reducing irritants and allergens that can affect comfort. Together, these components address how warm or cool you feel, how moist or dry the air is, how fresh the air seems, and how clean it is. The option that lists all five factors—temperature, humidity, circulation, ventilation, and filtration—best matches these essential elements. The other choices miss one or more of these components, so they don’t fully capture what contributes to indoor comfort.