ASHRAE Standard 62 and LEED Certification

(1)



ASHRAE Standard 62.1 and

LEED Certification

V

entilation

entilation for Acceptable Indoor Air Quality

for Acceptable Indoor Air Quality

Stephen

Stephen Haines, Haines, EITEIT, LEED AP, LEED AP JBA Consulting Engineers JBA Consulting Engineers Mechanical Engineering Mechanical Engineering

(2)

What is

ASHRAE Standard

ASHRAE Standard 62.1?

62.1?



 The Industries The Industries VVentilationentilation Standard

Standard 

 Purpose: “… to specify minimumPurpose: “… to specify minimum ventilation rates and other

ventilation rates and other

measures intended to provide

indoor air quality that is

indoor air quality that is acceptableacceptable

to human occupants and that

minimizes adverse

minimizes adverse healthhealth effects.” effects.” 

 Scope: Scope: All commercial, institutionalAll commercial, institutional and high-rise residential buildings

and high-rise residential buildings

(excludes low-rise residential)

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History of

ASHRAE Standard

ASHRAE Standard 62.1

62.1

1970 1970 1980 1980 1990 1990 2000 2000 20102010 1973 1973 First Issued First Issued (Office – 15 cfm/person) (Office – 15 cfm/person) 1984 1984 Steve’s birthday Steve’s birthday 1981 1981 Lower Rates Lower Rates (Office – 5 cfm/person) (Office – 5 cfm/person) 1989 1989 Higher Rates Higher Rates (Office – 20 cfm/person) (Office – 20 cfm/person) 1999 1999 Little Change Little Change 2001 2001 More Mandatory More Mandatory Language Language 2004 2004 Key Changes: Key Changes: Ventilation Rate Ventilation Rate Procedure Procedure 2007 2007 Corrections, Corrections, Clarifications Clarifications 2010 2010 Most Current Most Current

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Key Changes in 62.1-2004



 Area-relat Area-related and occuped and occupancy-reancy-related ventilation lated ventilation componentscomponents



 Minimum Ventilation Rate Table revised to apply only to non-smokingMinimum Ventilation Rate Table revised to apply only to non-smoking

areas (smoking areas are still not addressed) areas (smoking areas are still not addressed)



 Appendix G Appendix G – Existing B– Existing Buildingsuildings



 Additions, Eq Additions, Equipment reuipment replacements, Suplacements, Substantial abstantial alterationslterations



 Indoor Air Humidity (65% max) and pressure requirements (positive whenIndoor Air Humidity (65% max) and pressure requirements (positive when

dehumidifying) dehumidifying)



(5)

Why is

ASHRAE 62.1

Important?



 It is the basis for many ventilationIt is the basis for many ventilation codescodes 

 More stringent than codes in some More stringent than codes in some cases and helps establish thecases and helps establish the “

“standard-of-carestandard-of-care””



 Compliance with ASHRAE Standard 62.1-2007 is a prerequisite forCompliance with ASHRAE Standard 62.1-2007 is a prerequisite for any

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Two Paths to Compliance



 Ventilation Rate ProcedureVentilation Rate Procedure



 Most commonly used methodMost commonly used method



 TTable 6-1 able 6-1 Minimum Ventilation Rates in Minimum Ventilation Rates in Breathing ZoneBreathing Zone



 Need to determine the zone air distribution effectiveness (ENeed to determine the zone air distribution effectiveness (E_z_z))



 LEED requires this method for complianceLEED requires this method for compliance



 Indoor Air Quality Indoor Air Quality ProcedureProcedure



 Designed to maintain specific contaminant levelsDesigned to maintain specific contaminant levels



 Mass balance analysisMass balance analysis



 Methods used in similar buildingsMethods used in similar buildings



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Ventilation Rate Procedure

(8)

Ventilation Rate Procedure



 Note the fNote the following rooms do not require area-based ventilation per ASHRAE Stanollowing rooms do not require area-based ventilation per ASHRAE Standard 62.1-2007:dard 62.1-2007:



 Electrical equipment roomsElectrical equipment rooms



 TTelecommunicationelecommunications/data s/data roomsrooms



 Elevator machine roomsElevator machine rooms



 Other similar non-occupied spacesOther similar non-occupied spaces



 Clarified under Interpretation IC 62.1-2007-17 approved on January 23, 2010Clarified under Interpretation IC 62.1-2007-17 approved on January 23, 2010



(9)

Ventilation Rate Procedure



 Note the fNote the following rooms do not require area-based ventilation per ASHRAE Stanollowing rooms do not require area-based ventilation per ASHRAE Standard 62.1-2007:dard 62.1-2007:



 Electrical equipment roomsElectrical equipment rooms



 TTelecommunicationelecommunications/data s/data roomsrooms



 Elevator machine roomsElevator machine rooms



 Other similar non-occupied spacesOther similar non-occupied spaces



 Clarified under Interpretation IC 62.1-2007-17 approved on January 23, 2010Clarified under Interpretation IC 62.1-2007-17 approved on January 23, 2010



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Classroom Example

Single Zone - 62.1-2007



 High School Classroom 35’ x 35’ (30 people)High School Classroom 35’ x 35’ (30 people)



 Breathing Zone Outdoor Airflow (VBreathing Zone Outdoor Airflow (V_bz_bz) = R) = R_p_pPP_z_z + R + R_a_a A A_z_z



 Occupancy component - 10 cfm/person – 10 x 30 people = 300 cfmOccupancy component - 10 cfm/person – 10 x 30 people = 300 cfm



 Area compon Area component - 0.12 cfent - 0.12 cfm/ftm/ft22 – 0.12 x (35’ x 35’) = 147 cfm – 0.12 x (35’ x 35’) = 147 cfm



 Zone Outdoor Airflow (VZone Outdoor Airflow (V_oz_oz) = V) = V_bz_bz/E/E_z_z



 VV_oz_oz = (300 + 147)/1.0 = 447 cfm or 14.9 cfm/person = (300 + 147)/1.0 = 447 cfm or 14.9 cfm/person



 Be careful with EBe careful with E_z_z values! Most of the time E values! Most of the time E_z_z = 0.8 in heating mode which = 0.8 in heating mode which

yields a

yields a higher higher ventilation rate requirement. ventilation rate requirement. Reference TReference Table 6-2!able 6-2!

Zone Air Distribution Effectiveness

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Ventilation Rate Procedure

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Multiple Zone Recirculating

Systems



 VV_ou_ou = ∑(= ∑(RR_p_pPP_z_z + R + R_a_a A A_z_z) for all zones – Uncorrected Outdoor Air Intake) for all zones – Uncorrected Outdoor Air Intake



 VV_ot_ot = V = V_ou_ou/E/E_v_v – Outdoor – Outdoor Air IntakeAir Intake



 To determine the System Ventilation Efficiency (ETo determine the System Ventilation Efficiency (E_v_v), use Table 6-3 with the), use Table 6-3 with the

Zone Primary Outdoor Air Fraction Z Zone Primary Outdoor Air Fraction Z_p_p



 Primary Outdoor Air Fraction ZPrimary Outdoor Air Fraction Z_p_p



 ZZ_p_p = V = V_oz_oz/V/V_pz_pz



 VV_oz_oz – Zone outdoor airflow – Zone outdoor airflow



 VV_pz_pz – Zone primary airflow (for VAV systems V – Zone primary airflow (for VAV systems V_pz_pz is the is the minimumminimum expected expected

primary airflow for design purposes) primary airflow for design purposes)

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Multiple Zone Example

Office Office 15’x10’ 15’x10’ 1 Occupant 1 Occupant 100 cfm SA 100 cfm SA Office Office 15’x10’ 15’x10’ 1 Occupant 1 Occupant 100 cfm SA 100 cfm SA Storage Storage 10’x10’ 10’x10’ 0 Occupants 0 Occupants 50 cfm SA 50 cfm SA Office Office 18’x10’ 18’x10’ 2 Occupants 2 Occupants 150 cfm SA 150 cfm SA Office Office 18’x10’ 18’x10’ 2 Occupants 2 Occupants 150 cfm SA 150 cfm SA Break Room Break Room 10’x20’ 10’x20’ 4 Occupants 4 Occupants 200 cfm SA 200 cfm SA Corridor Corridor 4’ wide 4’ wide 0 Occupants 0 Occupants 150 cfm SA 150 cfm SA Office Office 10’x20’ 10’x20’ 2 Occupants 2 Occupants 150 cfm SA 150 cfm SA Conference Conference 12’x12’ 12’x12’ 6 Occupants 6 Occupants 150 cfm SA 150 cfm SA

Note: supply airflows

are heating

are heating minimumminimum

values

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Multiple Zone Example



 VV_ou_ou = ∑(= ∑(RR_p_pPP_z_z + R + R_a_a A A_z_z) for all ) for all zones – uncorrected outdoor air intakezones – uncorrected outdoor air intake



 OfficesOffices 

 15’ x 10’ x (0.06 cfm/ft15’ x 10’ x (0.06 cfm/ft22) + 1 person x 5 cfm/person = 14 cfm OA) + 1 person x 5 cfm/person = 14 cfm OA 

 10’ x 20’ x (0.06 cfm/ft10’ x 20’ x (0.06 cfm/ft22) + 2 people x 5 cfm/person = 22 cfm OA) + 2 people x 5 cfm/person = 22 cfm OA 

 Office totalOffice total 

 (14 cfm) x 2 + 22 cfm + (14 cfm) x 2 + 22 cfm + (21 cfm) x 2(21 cfm) x 2 

(15)

Multiple Zone Example



 Break RoomBreak Room 

 ConferenceConference 

 12’ x 12’ x (0.06 cfm/ft12’ x 12’ x (0.06 cfm/ft22) + 6 people x 5 cfm/person = 39 cfm OA) + 6 people x 5 cfm/person = 39 cfm OA   StorageStorage   10’ x 10’ x (0.12 cfm/ft10’ x 10’ x (0.12 cfm/ft22) = 12 cfm OA) = 12 cfm OA   CorridorCorridor   296 ft296 ft22 x (0.06 cfm/ft x (0.06 cfm/ft22) = 18 cfm OA) = 18 cfm OA

(16)

Multiple Zone Example



 Office total – 92 cfmOffice total – 92 cfm 

 Break room – 32 cfmBreak room – 32 cfm   Conference – 39 cfmConference – 39 cfm   Storage – 12 cfmStorage – 12 cfm   Corridor -18 cfmCorridor -18 cfm 

(17)

Multiple Zone Example



 Building total = 194 cfm OABuilding total = 194 cfm OA 

 But VBut V_ou_ou is the “uncorrected” outdoor air intake – is the “uncorrected” outdoor air intake – we also have towe also have to account for the System Ventilation Efficiency (E

account for the System Ventilation Efficiency (E_v_v))



 What exactly is the System Ventilation Efficiency?What exactly is the System Ventilation Efficiency? 

(18)

System Ventilation Efficiency



 The System Ventilation Efficiency (EThe System Ventilation Efficiency (E_v_v) increases the outside air at the) increases the outside air at the

system to account for the critical zones system to account for the critical zones



 ExampleExample



 The critical zone is a conference room where the zone requires 50%The critical zone is a conference room where the zone requires 50%

of the minimum supply air to be outside air of the minimum supply air to be outside air



 Based on the building area and occupant requirements for ventilation,Based on the building area and occupant requirements for ventilation,

the % outside air at the air handling unit is only 15% the % outside air at the air handling unit is only 15%



 The critical zone willThe critical zone will alwaysalways be underventilated under these conditions be underventilated under these conditions



 ASHRAE ASHRAE says we nsays we need to increaseed to increase the outse the outside air at the uide air at the unit tonit to

compensate for this compensate for this



(19)

Multiple Zone Example



 Lets calculate the Lets calculate the Zone Primary Outdoor Air Fraction for each Zone Primary Outdoor Air Fraction for each zonezone 

 ZZ_p_p = V = V_oz_oz/V/V_pz_pz 

 Office 1 – 15’ x 10’Office 1 – 15’ x 10’ 

 ZZ_p_p = (18 cfm OA)/(100 cfm SA) = 0.18 = (18 cfm OA)/(100 cfm SA) = 0.18 

 Office 2 – 10’ x 20’Office 2 – 10’ x 20’ 

 Office 3 – 18’ x 10’Office 3 – 18’ x 10’ 

(20)

Multiple Zone Example



 Break RoomBreak Room 

 ConferenceConference 

 StorageStorage 

 CorridorCorridor 

(21)

Multiple Zone Example

  Office 1 – ZOffice 1 – Z_p_p = 0.18 = 0.18   Office 2 – ZOffice 2 – Z_p_p = 0.19 = 0.19   Office 3 – ZOffice 3 – Z_p_p = 0.18 = 0.18 

 Break Room - ZBreak Room - Z_p_p = 0.20 = 0.20

  Conference - ZConference - Z_p_p = 0.33 = 0.33   Storage - ZStorage - Z_p_p = 0.30 = 0.30   Corridor - ZCorridor - Z_p_p = 0.16 = 0.16 

(22)

Multiple Zone Example



 VV_ot_ot = V = V_ou_ou/E/E_v_v – Outdoor – Outdoor Air IntakeAir Intake 

 Using Table 6-3 with ZUsing Table 6-3 with Z_p_p = 0.33 and by interpolating, E = 0.33 and by interpolating, E_v_v = 0.82 = 0.82 

 VV_ot_ot = (194 cfm)/0.82 = (194 cfm)/0.82 

 VV_ot_ot = 236 cfm OA required = 236 cfm OA required 

(23)

Multiple Zone Example



 Now what happens if Now what happens if we increase the VAwe increase the VAV box V box minimums on the critical zones?minimums on the critical zones? 

 Conference (increased minimum SA from 150 cfm to 250 Conference (increased minimum SA from 150 cfm to 250 cfm)cfm) 

 ZZ_p_p = (49 cfm OA)/(250 cfm SA) = 0.20 (previously 0.33) = (49 cfm OA)/(250 cfm SA) = 0.20 (previously 0.33) 

 Storage (increased minimum SA Storage (increased minimum SA from 50 cfm to 100 from 50 cfm to 100 cfm)cfm) 

 ZZ_p_p = (15 cfm OA)/(100 cfm SA) = 0.15 (previously 0.30) = (15 cfm OA)/(100 cfm SA) = 0.15 (previously 0.30) 

 Using Table 6-3 with the max ZUsing Table 6-3 with the max Z_p_p = 0.20 and by interpolating, E = 0.20 and by interpolating, E_v_v = 0.95 = 0.95 

 VV_ot_ot = (194 cfm)/0.95 = (194 cfm)/0.95 

 VV_ot_ot = 205 cf = 205 cfm OA requiredm OA required 

 Use 205 cfm OA instead of 240 cfmUse 205 cfm OA instead of 240 cfm

0.95

(24)

Alternative Procedures



 Appendix Appendix AA 

 Another way to calcu Another way to calculate System Vlate System Ventilation Efficiencentilation Efficiency (Ey (E_v_v) other) other than using Table 6-3

than using Table 6-3



 EE_v_v = minimum (E = minimum (E_vz_vz)) 

 EE_vz_vz = 1 + X = 1 + X_s_s – Z – Z_d_d 

 XX_s_s is is the Athe Average Outdoor Air Fraction at the verage Outdoor Air Fraction at the air handling unitair handling unit 

 ZZ_d_d is the Discharge Outdoor Air Fraction at the zone is the Discharge Outdoor Air Fraction at the zone 

 In our Multiple Zone In our Multiple Zone Example,Example, 

 EE_v_v = 1 + = 1 + (194 cfm)/(1200 cfm) – 0.33 = 1 + 0.16 – 0.33 (194 cfm)/(1200 cfm) – 0.33 = 1 + 0.16 – 0.33 = 0.83= 0.83 

 VV_ot_ot = (194 cfm)/0.83 = 234 cfm – very similar result = (194 cfm)/0.83 = 234 cfm – very similar result 

 All zone Z All zone Z_p_p values do not necessarily need to be values do not necessarily need to be calculated, justcalculated, just the “critical zones”

(25)

Title 24 Requirements



 But what about Title 24?But what about Title 24? 

 Based on Section 121 – Requirements for VentilationBased on Section 121 – Requirements for Ventilation 

 Mechanical VentilationMechanical Ventilation 

 The conditioned floor area of tThe conditioned floor area of the space times the applicablehe space times the applicable ventilat

ventilation rate ion rate from Tfrom Table 121-A able 121-A oror



 15 cfm/person times the expected number of 15 cfm/person times the expected number of occupantsoccupants 

(26)

Multiple Zone Example



 Area-based ven Area-based ventilation rate:tilation rate: 

 Table 121-A for office space (other) is 0.15 cfm/sfTable 121-A for office space (other) is 0.15 cfm/sf 

 Required OA Required OA = 1,600 sf = 1,600 sf x 0.15 cfm/sf = x 0.15 cfm/sf = 240 cfm240 cfm 

 People-basPeople-based ventilation ed ventilation rate:rate: 

 15 cfm/person15 cfm/person 

 Required OA = 18 people x 15 cfm/person = 270 cfmRequired OA = 18 people x 15 cfm/person = 270 cfm 

 Title 24 Ventilation – 270 cfmTitle 24 Ventilation – 270 cfm 

 ASHRAE Stan ASHRAE Standard 62.1 Vdard 62.1 Ventilation – 240 cfmentilation – 240 cfm 

(27)

Title 24 Requirements



 Section 144 (d) – Section 144 (d) – Space-condSpace-conditioning Zone itioning Zone ControlsControls 

 Minimizes reheating to reduce energy useMinimizes reheating to reduce energy use 

 The volume of primary air The volume of primary air that is reheated, re-cooled, or mixed airthat is reheated, re-cooled, or mixed air supply shall not exceed the larger of:

supply shall not exceed the larger of:



 50 percent of the peak primary airflow, or50 percent of the peak primary airflow, or



 The design zone outdoor airflow rate per Section 121The design zone outdoor airflow rate per Section 121



 May not be possible to May not be possible to increase minimum zone airflows to reduceincrease minimum zone airflows to reduce Z

(28)

Title 24 Requirements



 Section 121 (c) – Operation and Section 121 (c) – Operation and Control RequirementsControl Requirements 

 Required Demand Control VentilationRequired Demand Control Ventilation 

 COCO₂₂ sensors required in densely occupied spaces (occupant sensors required in densely occupied spaces (occupant density greater than or equal to 25 people per 1,000 sf)

density greater than or equal to 25 people per 1,000 sf)



 May reduce OA for these spaces based on COMay reduce OA for these spaces based on CO₂₂ levels levels 

 Dynamic Reset not a Dynamic Reset not a requirement in ASHRrequirement in ASHRAE Standard 62.1AE Standard 62.1 

(29)

ASHRAE 62.1 Design T

ips



 Identify the “critical zones”Identify the “critical zones”



 High occupant density and low airflow requirement (i.e. little to no envelopeHigh occupant density and low airflow requirement (i.e. little to no envelope

load) load)



 Interior conference/meeting roomsInterior conference/meeting rooms



 Interior waiting/lobby areasInterior waiting/lobby areas



 Interior break roomsInterior break rooms



 Not necessarily limited to interior zones (north-facing Not necessarily limited to interior zones (north-facing and no glass)and no glass)



 Increase VAV box minimum airflows in critical zones to reduce outsideIncrease VAV box minimum airflows in critical zones to reduce outside air where possible [ watch out for Title 24 Section 144 (d) ]

air where possible [ watch out for Title 24 Section 144 (d) ]



(30)

ASHRAE 62.1 Design T

ips



 May account for Occupant Diversity – the May account for Occupant Diversity – the ratio of the systemratio of the system population to the sum of

population to the sum of the zone populationsthe zone populations



 Utilize calculation spreadsheetUtilize calculation spreadsheet



 Spreadsheet provided with ASHRAE 62.1 User’s ManualSpreadsheet provided with ASHRAE 62.1 User’s Manual



 Allows y Allows you to input only ou to input only the critical the critical zoneszones



 Spreadsheet Spreadsheet uses Appendix A uses Appendix A approachapproach 

 Caution!Caution!



 Don’t forget about building pressurization - a pressurization calcDon’t forget about building pressurization - a pressurization calc

should be done to ensure that the building is positively pressurized should be done to ensure that the building is positively pressurized which could result in higher air quantities than ASHRAE 62.1 requires which could result in higher air quantities than ASHRAE 62.1 requires



 Make sure heating minimum supply air values can handle the zoneMake sure heating minimum supply air values can handle the zone

heat losses with the selected reheat coil heat losses with the selected reheat coil

(31)

LEED Compliance



 LEED Version 3.0 requires that the design meet the minimumLEED Version 3.0 requires that the design meet the minimum

requirements of Sections 4 through 7 of ASHRAE Standard 62.1-2007 requirements of Sections 4 through 7 of ASHRAE Standard 62.1-2007



 IEQ Prerequisite 1 – Minimum IAQ Performance (mandatory)IEQ Prerequisite 1 – Minimum IAQ Performance (mandatory)



 IEQ Credit 2 – Increased Ventilation (optional)IEQ Credit 2 – Increased Ventilation (optional)



 The Ventilation Rate Procedure must be correctly documented andThe Ventilation Rate Procedure must be correctly documented and

uploaded to LEED Online for review uploaded to LEED Online for review



 Best method – “62MZCalc” spreadsheetBest method – “62MZCalc” spreadsheet 

 Pre-programmed spreadsheet templatePre-programmed spreadsheet template



 Accepted by USGBC Accepted by USGBC



 Available with purchase of ASHRAE 62.1 User’s Manual Available with purchase of ASHRAE 62.1 User’s Manual



(32)

LEED Compliance – 62MZCalc

System Ev = 0.84 System Ev = 0.84 Required V Required V_ot_ot= 229 cfm= 229 cfm Critical Zone Critical Zone Entered Values Entered Values

(33)

LEED Compliance – 62MZCalc



 “62MZCalc” spreadsheet tips“62MZCalc” spreadsheet tips



 Required only to input “potentially critical zones”Required only to input “potentially critical zones”



 Analyze all operating conditions Analyze all operating conditions



 Cooling modeCooling mode



 Heating modeHeating mode



 Apply occupant diversity (D) where possible Apply occupant diversity (D) where possible



 Check with Architect for a building program Check with Architect for a building program or design occupancyor design occupancy



 May be based on full-time equivalent (FTE) occupantsMay be based on full-time equivalent (FTE) occupants



 Spreadsheet instructionsSpreadsheet instructions



(34)

LEED Compliance



 LEED Documentation MaterialsLEED Documentation Materials



 IEQp1 Submittal Template (LEED Online form v3.0 or Template PDF v2.2)IEQp1 Submittal Template (LEED Online form v3.0 or Template PDF v2.2)



 ASHRAE Standard 62.1 Docume ASHRAE Standard 62.1 Documentation of the VRPntation of the VRP



 “62MZCalc” Spreadsheet“62MZCalc” Spreadsheet



 Trane TTrane Trace 700 race 700 Calculation ReportCalculation Report



 Carrier’s HAP Calculation ReportCarrier’s HAP Calculation Report



 Other suitable analysis programOther suitable analysis program



 Equipment schedules identifying design OA for all systemsEquipment schedules identifying design OA for all systems



(35)

LEED Compliance



 LEED Design Review ProcessLEED Design Review Process



 Design Application SubmissionDesign Application Submission



 Design Application Review GBCI (25 business days)Design Application Review GBCI (25 business days)



 Final Design ReviewFinal Design Review



 Appeals ($500 per credit) Appeals ($500 per credit)



 Design Application ReviewDesign Application Review



 Pending IssuesPending Issues



 “It is unclear…”“It is unclear…”



 TTechnicechnical Adviceal Advice



(36)

Design Appl

ication

Review

Comments

The LEED Submittal T

The LEED Submittal Template has been provided stemplate has been provided stating that the ating that the project complies with theproject complies with the

minimum requirements of ASHRAE Standards 62.1-2004. A narrative has been provided

describing the project's ventilation system design. However, specific information regarding the

fresh air intake volumes has not been

fresh air intake volumes has not been provided.provided.

TECHNICAL

TECHNICAL ADVICE: Please provide a ADVICE: Please provide a more detailed narrative or resubmit tmore detailed narrative or resubmit the LEEDhe LEED

Submittal T

Submittal Template to include a emplate to include a more detailed narrative that more detailed narrative that includes specific informationincludes specific information

regarding the fresh air intake volumes.

(37)

Design Appl

ication

Review

Comments

The LEED Submittal Template has been provided stating that the project complies with the minimum requirements of

ASHRAE Standard 62.1-2004, Ventilat

ASHRAE Standard 62.1-2004, Ventilation for Acceptable Indoor Air Quality, using the Ventilation for Acceptable Indoor Air Quality, using the Ventilation Rate Procedure… However,ion Rate Procedure… However,

two issues are pending:

1.

1. The documentation and Ventilation Rate Procedure (VRP) calculations indicate an Ez value of 1.0 for all VRP calculations,The documentation and Ventilation Rate Procedure (VRP) calculations indicate an Ez value of 1.0 for all VRP calculations,

and it is unclear whether the operating conditions represented in the calculations reflect the worst-case scenario.

2.

2. It is unclear how the SysIt is unclear how the System Ventilation Efficiency (Ev) value has been determined. In addition, it is unclear which ztem Ventilation Efficiency (Ev) value has been determined. In addition, it is unclear which zone, forone, for

each unit serving multiple zones, is the critical zone. Therefore, it is unclear whether the critical zone has been used to

determine the Primary Outdoor Air Fraction (Zp) and System Ventilation Efficiency (Ev) values.

TECHNICAL ADVICE:

1.

1. Please provide revised VRP calculations demonstrating that the values have been adjusted such Please provide revised VRP calculations demonstrating that the values have been adjusted such that they are inthat they are in

compliance with ASHRAE Standard 62.1-2004, Table 6.2. Provide a detailed narrative including specific information regarding

the selection of the worst-case design conditions for the VRP calculations. Alternatively, include information explaining the

selection of an Ez value of 1.0 for all systems.

2.

2. Indicate in the narrative how the Ev vIndicate in the narrative how the Ev value has been determined, as well as the critical zone for alue has been determined, as well as the critical zone for each unit serving multipleeach unit serving multiple

zones. If necessary, provide revised calculations demonstrating that the critical zone has been used to determine the Primary

Outdoor Air Fraction (Zp) and System Ventilation Efficiency (Ev) values.

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Design Appl

ication

Review

Comments

The LEED P

The LEED Prerequisite Form has been provided stating that rerequisite Form has been provided stating that the project is the project is mechanically ventilated and mechanicallymechanically ventilated and mechanically

conditioned, therefore the project applies Case 1. T

conditioned, therefore the project applies Case 1. The project has utilized the he project has utilized the VRP Compliance Calculator.VRP Compliance Calculator.

However, the tenant guidelines do not indicate the requirements of

However, the tenant guidelines do not indicate the requirements of ASHRAE 62.1-2007 must be met and ASHRAE 62.1-2007 must be met and a copy ofa copy of

the legally binding document (e.g. lease, sales agreement),

the legally binding document (e.g. lease, sales agreement), specifying minimum performance criteria for IEQp1 forspecifying minimum performance criteria for IEQp1 for

the tenant work, has not bee

the tenant work, has not been provided.n provided.

TECHNICAL ADVICE:

1.

1. Provide revised tenant guideliProvide revised tenant guidelines to include a reference to meeting the minines to include a reference to meeting the minimum requirements of mum requirements of ASHRAE 62.1-ASHRAE

62.1-2007 and ensure that a copy of t

2007 and ensure that a copy of the legally binding document (e.g. lease, sales agreement), explicitlhe legally binding document (e.g. lease, sales agreement), explicitly stating they stating the

performance requirements for the tenant work is included.

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Other Important Sections in

ASHRAE 62.1



 Minimum MERV ratings for filters (minimum MERV 6 upstream ofMinimum MERV ratings for filters (minimum MERV 6 upstream of cooling coils)

cooling coils)



 Exhaust rates (Table 6.4)Exhaust rates (Table 6.4)



 RestroomsRestrooms



 Copy/printing roomsCopy/printing rooms



 Kitchenettes (break rooms)Kitchenettes (break rooms)



 Chemical storage rooms (housekeeping)Chemical storage rooms (housekeeping)



 Natural ventilation – specifies location and size of openings in lieu ofNatural ventilation – specifies location and size of openings in lieu of or in addition to

or in addition to mechanical ventilationmechanical ventilation



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References



 ASHRAE Stan ASHRAE Standard 62.1dard 62.1 

 PDFs available of older versions of the PDFs available of older versions of the StandardStandard 

 ASHRAE 62 ASHRAE 62.1 User’s Manual.1 User’s Manual 

 More detailed explanation of the Ventilation Rate ProcedureMore detailed explanation of the Ventilation Rate Procedure 

 Example problemsExample problems 

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