1. What is Fresh Air Intake Calculation?

The Fresh Air Intake calculation determines the minimum required ventilation rate based on the number of occupants in a space. It follows ASHRAE Standard 62.1 guidelines for indoor air quality and ventilation.

2. How Does the Calculator Work?

The calculator uses the fresh air intake formula:

Where:

• \( CFM \) — Cubic Feet per Minute of fresh air required
• \( Occupants \) — Number of people in the space
• \( 20 \) — ASHRAE minimum fresh air intake per person (cfm/person)

Explanation: This calculation ensures adequate ventilation to maintain indoor air quality and occupant comfort according to ASHRAE standards.

3. Importance of Fresh Air Intake Calculation

Details: Proper fresh air intake is essential for maintaining indoor air quality, preventing buildup of CO2 and contaminants, ensuring occupant health and comfort, and meeting building code requirements.

4. Using the Calculator

Tips: Enter the number of occupants in the space. The value must be a positive integer. The calculator will determine the minimum required fresh air intake in CFM.

5. Frequently Asked Questions (FAQ)

Q1: What is ASHRAE Standard 62.1?
A: ASHRAE Standard 62.1 specifies minimum ventilation rates and other requirements for commercial and institutional buildings to provide acceptable indoor air quality.

Q2: Why is 20 CFM per person used?
A: 20 CFM per person is the minimum outdoor air requirement for office spaces and similar environments as specified in ASHRAE Standard 62.1.

Q3: Does this calculation apply to all building types?
A: No, different space types have different ventilation requirements. This calculator uses the standard office space requirement - consult ASHRAE 62.1 for specific space types.

Q4: What factors can affect fresh air requirements?
A: Space type, occupancy density, activities performed, local building codes, and specific air quality requirements can all affect ventilation needs.

Q5: Is this the only factor in ventilation design?
A: No, ventilation design also considers air distribution, filtration, humidity control, and overall HVAC system performance.