Common Values and Tables for Fresh Air CFM

In the process of calculating Fresh Air CFM, several key values and tables are essential. These values are typically provided in ISHRAE's book and are crucial for determining the appropriate ventilation requirements for different types of areas. Below, we have compiled a list of common values and tables that you will need.

CFM per Person

The amount of fresh air required per person varies depending on the type of area. Here are some common values:

• Office: 5 CFM per person
• Restaurant: 7.5 CFM per person
• Classroom: 10 CFM per person
• Conference Room: 5 CFM per person

CFM per Square Foot

This value represents the amount of fresh air required per square foot of area. Common values include:

• Office: 0.06 CFM per square foot
• Restaurant: 0.18 CFM per square foot
• Classroom: 0.12 CFM per square foot
• Conference Room: 0.06 CFM per square foot

Occupancy Values

The occupancy value indicates the number of people typically present in a given area. This is often expressed per 1000 square feet or 100 square meters. Here are some common occupancy values:

• Office: 5 people per 1000 square feet
• Restaurant: 70 people per 1000 square feet
• Classroom: 35 people per 1000 square feet
• Conference Room: 50 people per 1000 square feet

How to Use These Tables

To calculate the Fresh Air CFM for a specific area, you will need to use the formula:

Fresh Air CFM = (CFM per person * Number of People) + (CFM per square foot * Area in Square Feet)

1. Determine the type of area you are calculating for (e.g., office, restaurant).
2. Find the CFM per person and CFM per square foot values from the tables above.
3. Estimate the number of people and measure the area in square feet.
4. Plug these values into the formula to find the required Fresh Air CFM.

For example, for a restaurant with an area of 600 square feet and an estimated occupancy of 42 people:

CFM per person = 7.5
CFM per square foot = 0.18
Number of People = 42
Area = 600 square feet

Fresh Air CFM = (7.5 * 42) + (0.18 * 600)
              = 315 + 108
              = 423 CFM

By using these tables and the formula, you can ensure that any area receives the appropriate amount of fresh air for comfortable and safe ventilation.