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EPA Building Air Quality Guide-1991

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Indoor Air Quality Forms 179 Building Name: ____________________________________________________ File Number: _______________________ Address: ____________________________________________________________________________________________ Completed by (name):_____________________________________________________ Date: _______________________ This worksheet is designed for use with the Zone/Room Record. Appendix A provides guidance on methods of estimating the amount of ventilation (outdoor) air being introduced by a particular air handling unit. Appendix B discusses the ventilation recommendations of ASHRAE Standard 62-1989, which was developed for the purpose of preventing indoor air quality problems. Formulas are given below for calculating outdoor air quantities using thermal or CO 2 information. The equation for calculating outdoor air quantities using thermal measurements is: Outdoor air (in percent) = T return air - T mixed air T return air - T outdoor air Where: T = temperature in degrees Fahrenheit The equation for calculating outdoor quantities using carbon dioxide measurements is: Outdoor air (in percent) = C s - C r C 0 - C r Where: C s = ppm of carbon dioxide in the supply air (if measured in a room), or C s = ppm of carbon dioxide in the mixed air (if measured at an air handler) C r = ppm of carbon dioxide in the return air C o = ppm of carbon dioxide in the outdoor air Using the table below to estimate the ventilation rate in any room or zone. Note: ASHRAE 62-1989 generally states ventilation (outdoor air) requirements on an occupancy basis; for a few types of spaces, however, requirements are given on a floor area basis. Therefore, this table provides a process of calculating ventilation (outdoor air) on either an occupancy or floor area basis. Ventilation Worksheet x 100 x 100 Zone/Room Percent of Outdoor Air Total Air Supplied to Zone/Room (cfm) Peak Occupancy (number of people) or Floor Area (square feet) E = (Ax100) x D Outdoor Air Supplied Per Person (or per square foot area) E D C B A D= B C Total Air Supplied Per Person (or per square foot area)

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