Room Air Change Rate

DCR No. 97027
Revision No. 1

Effective: 3-7-97
Supersedes: 3-7-97
Revision Date: 5-7-97
Page No.: 1 of 3

1 Purpose

1.1 To establish a standard procedure to determine room air change rate.

2 Scope

2.1 This procedure will apply to all rooms.

3

References

4 Definition

3.1 NEBB Procedural Standards for Certified Testing of Cleanrooms, First Edition - October, 1988.

4.1 CFM Cubic Feet per Minute

4.2 Room Air Change Rate

4.2.1 The number of times the total volume of a given room in cubic feet is changed in a one hour span.

4.3 TAB Test, Adjust, and Balance

5 Responsibility

5.1 TAB technicians shall record all test readings on Form FN 8.026.1 (Air Changes Per Hour Test Report).

5.2 All test reports shall be saved in files located in the TAB Department of Therma.

5.3 All test equipment utilized shall be in calibration in accordance with NEBB Standards and traceable to the National Institute of Standards and Technology (NIST).

6 Materials Requirement

6.1 None

7 Test Equipment

7.1 Tape Measure

8

General Procedures

8.1 Review available blueprints and room pressure design diagrams.

8.2 Inspect any room pressure measurement devices.

8.3 Inspect the room for any obvious deficiencies that would affect the room pressure and airflow rates.

8.4 Determine the volume of each room to be tested by using the tape measure to determine the room length, width and height. Volume = L x W x H.

8.5 Measure the actual inlet airflow as per SOP 8.005 (Air Outlet Testing).

8.6 Record all data on the Form FN 8.026.1 (Air Changes Per Hour Test Report.

8.7 Room air change rate = (Supply CFM X 60)/ Room Volume

9

Review and Approval

9.1 Return the Form FN 8.026.1 (Air Changes Per Hour Test Report) to the TAB Department for review.

Document Approval

General Foreman

4.15 Date

5-97

Service Manager

4-15 Date

97

Quality Assurance Manager

4-16.

97

Date