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ASHRAE Std 62.1-2007 Ventilation for Acceptable Indoor Air Quality ASHRAE 62.1 update: Overview - Where are we now? PowerPoint Presentation
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ASHRAE Std 62.1-2007 Ventilation for Acceptable Indoor Air Quality ASHRAE 62.1 update: Overview - Where are we now? - PowerPoint PPT Presentation


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ASHRAE Std 62.1-2007 Ventilation for Acceptable Indoor Air Quality ASHRAE 62.1 update: Overview - Where are we now?. ASHRAE Std 62 update An Outline. General comments General requirements Ventilation requirements Construction and O/M requirements Questions.

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ASHRAE Std 62.1-2007 Ventilation for Acceptable Indoor Air QualityASHRAE 62.1 update:Overview - Where are we now?

ashrae std 62 update an outline
ASHRAE Std 62 updateAn Outline
  • General comments
  • General requirements
  • Ventilation requirements
  • Construction and O/M requirements
  • Questions
ashrae standard 62 what s its history
ASHRAE Standard 62What’s Its History?
  • 62-2001
  • Prescriptive
  • Commissioning
  • O&M
  • Combustion air
  • Filtration
  • 62-1999
  • IAQ-Health disclaimers
  • Smoking disclaimers
  • Clarified CO2as ventilation metric

62-1981Alternative Air Quality Proc.

62.1-2007Updated

1970

1980

1990

2000

2010

  • 62-1989
  • Removed Thermal Comfort
  • Ventilation Rate Proc.
  • IAQ Proc.
  • 62.1-2004
  • Commercial and High Rise Res.
  • Enforceable code language
  • ETS vent. rates not covered
  • Vent. Rate. Proc. Modified
  • Occupant and area vent. rates

62-1973first issued

ashrae standard 62 1 2007 related activities
ASHRAE Standard 62.1-2007 & Related Activities…
  • Std 62.1-2007 is the most current version
  • IMC adopted methodology and rates in 2007 Supplement
  • Several educational courses are available from ASHRAE
62 1 2007 purpose
62.1-2007 Purpose
  • 1.1 Specify minimum ventilation rates and other measures intended to provide IAQ that is acceptable to human occupants and that minimizes adverse health effects.
  • 1.2 Intended for regulatory application to new buildings, and additions
  • 1.3 Guide the improvement of IAQ in existing buildings.
62 1 2007 scope
62.1-2007 Scope
  • 2.1 All spaces intended for human occupancy.
  • 2.2 Defines requirements for ventilation, air-cleaning design, commissioning, installation and O&M
  • 2.3 Additional requirements and other standards may apply (labs, healthcare, industrial, etc.)
  • 2.4 May be applied to both new and existing buildings, not intended to be used retroactively
  • 2.5 Does not prescribe specific ventilation rates for smoking spaces
62 1 2007 scope con t
62.1-2007 Scope Con’t
  • 2.6 Ventilation requirements based on chemical, physical, & biological contaminants
  • 2.7 Consideration or control of thermal comfort is not included
  • 2.8 Contains requirements, in addition to ventilation related to certain sources
62 1 2007 scope con t1
62.1-2007 Scope Con’t
  • 2.9 Acceptable IAQ may not be reached in all buildings meeting these requirements because of special conditions noted
  • Definition Acceptable Indoor Air Quality: air in which there are no known contaminants at harmful concentrations as determined by cognizant authorities and with which a substantial majority (80% or more) of the people exposed do not express dissatisfaction
general requirements 4 0 outdoor air quality
General Requirements4.0 Outdoor Air Quality
  • 4.1 Regional Air Quality
    • Must determine NAAQS attainment status www.EPA.gov
    • If nonattainment, air cleaning is required in some cases
  • 4.2 Local Air Quality
    • Conduct observational site survey to identify local sources of air contaminants
general requirements 4 0 outdoor air quality1
General Requirements4.0 Outdoor Air Quality
  • 4.3 Documentation
    • Regional air quality compliance status
    • Local survey information
    • Conclusions regarding acceptability of outdoor air quality
general requirements 5 0 systems and equipment
General Requirements 5.0 Systems and Equipment
  • 5.1 Natural Ventilation. Must meet minimum requirements for location and size of openings
  • 5.2 Ventilation Air Distribution.
    • Must provide means to adjust (balance)
    • Must be sure that mixing occurs in RA/OA mixing plenums
general requirements 5 0 systems and equipment1
General Requirements 5.0 Systems and Equipment
  • 5.3 Exhaust Duct Location. Operate exhaust ducts(with harmful contaminants) at negative pressure
  • 5.4 Ventilation System Controls. Control to assure proper ventilation under any operating condition
  • 5.5 Airstream Surfaces. Use materials that have documented resistance to microbial growth and erosion
general requirements 5 0 systems and equipment2
General Requirements 5.0 Systems and Equipment
  • 5.6 Outdoor Air Intakes. Separate OA intake from outdoor contaminant sources
    • Must comply with default minimum separation distances in Table 5-1. Examples:
      • Loading dock 25 ft
      • Dumpster 15 ft
      • Surface below intake 1 ft
      • Cooling tower exhaust 25 ft
    • Must limit rain water penetration (using hood, proper velocity, etc.) or manage water that penetrates
    • Must use bird screens and prevent bird nesting
general requirements 5 0 systems and equipment3
General Requirements 5.0 Systems and Equipment
  • 5.7 Local Capture of Contaminants.
    • Discharge air from non-combustion equipment with exhaust vents must be exhausted to outdoors
  • 5.8 Combustion Air. Provide combustion air and exhaust air for indoor fuel-fired appliances
    • Products of combustion from vented appliances shall be vented directly outdoors.
general requirements 5 0 systems and equipment4
General Requirements 5.0 Systems and Equipment
  • 5.9 Particulate Matter Removal. Use a filter with a MERV 6 (or greater) upstream of dehumidifying coils and other wet-surface devices in supply stream
general requirements 5 0 systems and equipment5
General Requirements 5.0 Systems and Equipment
  • 5.10 Dehumidification Systems.
    • Must limit indoor RH to 65% or less at design dew point condition
      • Exception to RH limit: where occupancy requirements or processes dictate higher RH conditions.
    • Intake airflow must be greater than relief/exhaust during cooling (to minimize moist air infiltration)
general requirements 5 10 dehumidification systems
General Requirements5.10 Dehumidification Systems

At 75F, 65% rh gives a 13F “safety margin” before condensation

65% RH limit

62°F DP

general requirements 5 0 systems and equipment6
General Requirements 5.0 Systems and Equipment
  • 5.11 Drain Pans. Assure drainage without flooding or carryover
    • Slope: 1/8” per foot toward outlet
    • Drain: At lowest point, large enough to prevent overflow
    • Drain seal: P-trap or other seal for negatively pressurized drain pans to prevent ingestion of air while allowing complete drainage (fan on or off)
    • Pan size: length at least 1/2 coil height or as necessary to limit carryover
general requirements 5 0 systems and equipment7
General Requirements 5.0 Systems and Equipment
  • 5.12 Finned Tube Coils and Heat Exchangers
    • Use drain pan
    • Select to limit coil pressure drop to 0.75 in.wc.@ 500 fpm face velocity
    • If higher pressure drop, provide access on both sides for maintenance
general requirements 5 0 systems and equipment8
General Requirements 5.0 Systems and Equipment
  • 5.13 Humidifiers and Water Spray Systems
    • Use potable water (or better)
    • No downstream devices within absorption distance
  • 5.14 Access for Inspection, Cleaning and Maintenance.
general requirements 5 0 systems and equipment9
General Requirements 5.0 Systems and Equipment
  • 5.15 Building Envelope and Interior Surfaces
    • Weather barrier to prevent water penetration into envelope
    • Vapor retarder or other means to prevent condensation on cold surfaces within envelope
    • Seal all seams, joints, penetrations to limit infiltration
    • Insulate pipes, ducts expected to have surface temperature below surrounding dew point
general requirements 5 0 systems and equipment10
General Requirements 5.0 Systems and Equipment
  • 5.16 Buildings with Attached Parking Garages. Limit infiltration of vehicular exhaust
    • Maintain garage pressure at or below adjacent occupied space
    • Or, use a vestibule
    • Or, otherwise design to minimize air migration from garage to occupied space
general requirements 5 0 systems and equipment11
General Requirements 5.0 Systems and Equipment
  • 5.17 Air Classification and Recirculation. Limit recirculation or transfer of “dirty” air to “cleaner” spaces
  • 5.17.1 Classification - Designate air leaving each space using Table 6.1
      • Class 1: Low contaminant concentration (office)
      • Class 2: Moderate concentration (dining room)
      • Class 3: Significant concentration (sick room)
      • Class 4: Highly objectionable or potentially harmful concentration
general requirements 5 0 systems and equipment12
General Requirements 5.0 Systems and Equipment
  • 5.17.1 Classification

Manage recirculation as follows

    • Class 1 to anywhere
    • Class 2 to self, similar Class 2 or Class 3 or Class 4
    • Class 3 to self
    • Class 4 to outdoors
general requirements 5 0 systems and equipment13
General Requirements 5.0 Systems and Equipment
  • 5.17.2 Re-designation of air class
    • Air Cleaning. May reclassify air cleaned by passing it through an appropriate air-cleaning system
    • Transfer. Mixed classes are re-designated.
    • Energy Recovery. Energy recovery from class 2 (exhaust) airstreams must have no more than 10% leakage into a class 1 airstream.
general requirements 5 0 systems and equipment14
General Requirements 5.0 Systems and Equipment
  • 5.18 Requirements when building has both ETS and ETS-Free areas. Does not purport to achieve acceptable IAQ in ETS areas.
  • Spaces must be classified as ETS or ETS-Free
  • Air must be kept separate by means of walls, automatic door closers and pressurization
general requirements 5 0 systems and equipment15
General Requirements 5.0 Systems and Equipment
  • 5.18 (continued)
  • Recirculation or transfer from ETS to ETS-Free is prohibited
  • ETS areas must be exhausted to the outdoors
ventilation requirements 6 0 procedures
Ventilation Requirements 6.0 Procedures
  • 6.1 General. Ventilation Rate Procedure or IAQ Procedure for outdoor airflow values for mechanical ventilation systems
  • 6.1.1 Ventilation Rate Procedure. Prescribes rates & procedures based on typical space contaminant sources & source strengths
ventilation requirements 6 0 procedures1
Ventilation Requirements 6.0 Procedures
  • 6.1.2 IAQ Procedure. Requires calculation of rates based on analysis of contaminant sources, concentration targets and perceived air quality targets.
construction requirements 7 0 construction start up
Construction Requirements 7.0 Construction/Start-Up
  • 7.1 Construction Phase
    • Don’t operate air handlers without filters
    • Protect building materials
    • Protect occupied areas
    • Limit migration of construction contamination into occupied space
construction requirements 7 0 construction start up1
Construction Requirements 7.0 Construction/Start-Up
  • 7.1.5 Air Duct Construction shall be in accordance with the SMACNA duct construction standards and NFPA standards governing installation of HVAC systems
  • 7.2 System Start-Up. Balance airflow values, test drain pans, clean up before starting, test damper controls
construction requirements 7 0 construction start up2
Construction Requirements 7.0 Construction/Start-Up
  • 7.2.6 Documents including balance report, construction drawings and design criteria with assumptions shall be provided to Owner
operating requirements 8 0 operation maintenance
Operating Requirements 8.0 Operation & Maintenance
  • 8.2 Operations and Maintenance Manual.
    • Develop and maintain a building operations and maintenance manual which shall include a maintenance schedule with frequencies of tasks.

BuildingOperationManual

operating requirements 8 0 operation maintenance1
Operating Requirements 8.0 Operation & Maintenance
  • 8.3 Ventilation System Operation. Operate in accordance with Building Operations Manual
  • 8.4 Ventilation System Maintenance. Maintain in accordance with Building Operations Manual.
operating requirements 8 0 operation maintenance2
Operating Requirements 8.0 Operation & Maintenance
  • 8.4.1.4 Coil drains. Drain pans shall be inspected at least once a year and cleaned if required
  • 8.4.1.8 Outside Air Flow Verification. For units >2,000 cfm the outside air flow shall be tested a minimum of every 5 years and adjustments shall be made to have the design flow provided to system
ashrae 62 1
ASHRAE 62.1
  • Standard is under continuous maintenance process
  • You can propose a change to the standard
  • Notice of proposed changes appears in ASHRAE Standards Action
  • You can comment on proposed changes
  • You can request an interpretation
ashrae 62 11
ASHRAE 62.1
  • User’s manual for 62.1-2007
  • IMC & UMC Code adoption
  • ALI Short Course and Professional Development Course
  • eLearning course
  • IAQ Design Guideline is in the works
  • Next publication of ASHRAE 62.1, 2010
questions

Questions?

ASHRAE 62.1 update:Overview - Where are we now?