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 ANSI/ASHRAE Standard 62.1

What’s new in ventilation?

Kelley Cramm

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ANSI/ASHRAE Standard 62.1-2004Ventilation for Acceptable Indoor Air

Quality

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Introduction to Standard 62.1

•Consensus standard

•First published in 1973

•Now on continuous maintenance

•Backed by years of research

•Initially prescribed ventilation rates only

•Introduced “IAQ” Procedure in 1981

•Specifies “Breathing Zone Ventilation Rates”

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Introduction to Standard 62.1

•Applicable to new buildings and changes to

existing buildings

•Applies to all indoor or enclosed spaces

that people may occupy

•Also covers release of moisture inbathrooms, locker rooms, etc.

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Does not address smoking

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Includes Code Intended Language

• The standard has been incorporated in

one form or another in the model codes

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2003 International Mechanical Code

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IMC, UMC, OR

 ASHRAE 62.1-2004???

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• Available free for viewing on the ASHRAE

website

• Also available for purchase on the ASHRAE website

WWW.ASHRAE.ORG

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Why do we need a ventilation

standard?• Help insure indoor air quality acceptable to

human occupants• Minimize potential for adverse health

effects

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How do we define “Acceptable

Indoor Air Quality”?

• “Air in which there are no knowncontaminants at harmful

concentrations as determined by

cognizant authorities and which asubstantial majority (80% or more) of

the people exposed do not express

dissatisfaction.”

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Ventilation Rate Procedure

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• Verify outside air quality meets EPA

ambient air quality standards

• Treat outside air if required

• Carefully locate outside air intakes

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• Determine “breathing zone outdoor air flow”

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• Correct for Zone air distributioneffectiveness

• Correct for multiple zones (system

ventilation efficiency)

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Other Requirements

• Ventilation air flow must be maintained

during any load condition and at all timesthe space is occupied

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Other Requirements

• Drain pans must drain

• Maintenance access toequipment required

• Building envelope designed for

moisture control• Insulate to prevent

condensation

• Airstream surfaces must resistmold growth and erosion

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Outdoor Air Intakes

• Must prevent rain intrusion

• Must manage snowentrainment

• Must have bird screens

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Filters

• Minimum MERV 6 filters

required ahead of wet coils

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Relative Humidity

• Limited to 65% or less at

design dew point condition

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Smoking Areas

• Separate “ETS Free Areas”

from “ETS Areas”

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• Air movement within building mustobserve air classification requirements

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• Short term conditions

• CO2 measurement and control

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Space Pressurization

+ ++

Building Must be Positive

A Word About Clarifications

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 A Word About Clarifications

Sometimes there are unstated

motives

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What’s Next??

2007 EditionPick up addenda

Clarifications