ASHRAE+62.1-2022+(1) - Page 070

Extracted Content

L3.1 Filtration

 If PM10 standard is exceeded as reported in Section 4, is required filtration per Section 6.1.4.1 provided?  If PM2.5 standard is exceeded as reported in Section 4, is required filtration per Section 6.1.4.2 provided?  If ozone standard is exceeded, and the area is Serious, Severe15, Severe17, or Extreme, filtration per Section 6.1.4.3 is required unless an exception is documented.

L3.2 Ventilation Rates. Check compliance with the outdoor air ventilation rate at the intake ( Vot ) using the following process.

 Calculate Votdefault using Equation L-1 using the combined default rate ( Rc ) from Informative Appendix M and the occupiable area ( Az ) of each zone.

Votdefault =  all zones Rc × Az (L-1)

 Calculate additional ventilation required by Section 6.2.1.1.2. Additional ventilation is Votadditional.  Calculate Votmax using Equation L-2.

Votmax = Votdefault + Votadditional (L-2)

 Calculate Votmin using Equation L-3.

Votmin = Votmax × 0.75 (L-3)

 Designed system ventilation rate at the outdoor air intake ( Vot ) should fall between Votmin and Votmax .  Values of Vot for multiple-zone recirculating VAV systems should be close to Votmax .  Values of Vot for 100% (dedicated) outdoor air systems providing tempered air should be equivalent to Votmin .  Values of Vot for other systems should fall between these values.  If dynamic reset is included as a part of the design, does it comply with all requirements of Section 6.2.6?

Exceptions to L3.2:

1. Minimum outdoor airflow for multiple-zone recirculating systems designed using Normative Appendix A could be below Votmin . A calculation spreadsheet should be provided to confirm that Ev for the system is greater than 0.75.
2. Minimum outdoor airflow for systems designed using Normative Appendix C could be below Votmin . Calculation assumptions of any modeling criteria and results should be provided to confirm that Ez values are greater than 1.0.

L4. SECTION 6 INDOOR AIR QUALITY PROCEDURE

For the IAQP:

 Do the design documents provide evaluation of the following?  Compounds included in the design (Section 6.3.1)  List includes all contaminants of concern  Indoor sources and emissions rates for each compound  Outdoor sources and expected concentrations for each compound  Exposure periods and concentration limits  Evaluation of mixtures  Specification of perceived IAQ acceptability  Calculation of resultant concentrations from the design by mass balance  Do specifications include test methods?  Do specifications require that the subjective evaluation process be performed in the completed building?  If a substantially similar zone is used for subjective evaluation, are previous test results, conditions, and system design provided to verify that the zone is substantially similar?  If applicable, are appropriate specifications for dynamic reset monitoring and controls included?

68 ANSI/ASHRAE Standard 62.1-2022