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Public Reviews, June 2019

Public Reviews, June 2019

ANSI/ASHRAE/ASHE Standard 170- 2017, Ventilation of Health Care Facilities

The following is under a 45-day public review from May 17 to July 8:

1st Public Review of BSR/ASHRAE/ASHE Addendum e

The following changes come from a critical review of Chapters 5 and 10. The addendum improves the flow of the Standard by moving the “planning” requirements from Chapter 10 into Chapter 5 Planning.

The addendum also addresses the intent behind Change Proposal 170-16-12- 0001/007, harmonizing the Chapter 10 Construction and Start-up requirements with those in ASHRAE Standard 62.1. The SSPC 170 feels the changes represent minimum current design practices and should not present additional economic burden to health care facility construction.

ANSI/ASHRAE Standard 185.1-2015, Method of Testing UV-C Lights for Use in Air-Handling Units or Air Ducts to Inactivate Airborne Microorganisms

The following is under a 30-day public review from May 24 to June 23:

  • 1st Public Review of BSR/ASHRAE Addendum a

The liquid that is used in generating a bioaerosol will provide different levels of protection for the microorganism. For the tests to be repeatable, the generation of the bioaerosol must result in equal levels of protection. Thus, this addendum adds the requirement for the liquid to be the same.

  • 1st Public Review of BSR/ASHRAE Addendum b

The use of the Poisson distribution is not appropriate for this type of biological data. The degree of correction is based on the total count, so that a test with thousands of counts receives a tighter confidence interval than one with hundreds. This could result in very different report efficiencies between tests. Also, since counting plates for microorganisms requires that the spots be separate, there is an upper limit on the raw counts per plate. In addition, this method of calculation does not address the issue of variability at the test lab since the total counts are used. This addendum reports the counts, the average, and the standard deviation to give an average efficiency and a measure of the sample count variability.

ANSI/ASHRAE/USGBC/IES Standard 189.1-2017, Standard for the Design of High-Performance Green Buildings Except Low-Rise Residential Buildings

The following is under a 30-day public review from May 17 to July 1:

1st Public Review of BSR/ASHRAE/USGBC/IES Addendum ab

Addendum ab adds external view requirements as a jurisdictional option in Section 8–Indoor Environmental Quality. Where this option is selected, buildings are required to provide a view of the outdoors or an interior atrium from 50% of the floor area in offices, classrooms, and patient rooms.

ASHRAE Guideline 36-2018, High-Performance Sequences of Operation for HVAC Systems

The following are under a 30-day Public Review from June 14 to July 14:

  • 1st Public Review of Addendum a

The purpose of this addendum is to move Section 5.1.16 to a new section under Section 3 and assign the task of determining the controllable minimums to the control contractor who is best equipped to know the required information needed to determine the controllable minimum. The addendum also deletes Option 1, improves the explanation of how to determine the minimum controllable velocity pressure using multiple sources, and deletes the calculation of inlet VAV box area .

  • 1st Public Review of Addendum b

This addendum proposes to replace the current version of control for Trim & Respond so that trimming does not occur each timestep–basically, the logic is Trim or Respond, although the name is not changed given its common use in practice and in the literature.

  • 1st Public Review of Addendum c

This addendum revises VFD minimum speed read/write to reduce network traffic and reduce write cycles to nonvolatile memory in VFDs.

  • 1st Public Review of Addendum d

This addendum updates the description of the minimum heating airflow setpoint VHeat-min for consistency amongst variables (Section, revises damper control paragraph under Time-Averaged Ventilation (Section 5.2.2), adds missing reference to VHeat-min (Section 5.6.3), and adds missing damper control sequence to VAV Terminal Units with Reheat (Section 5.6.6).

The following is under a 45-day Public Review from June 14 to July 29:

1st Public Review of Addendum e

This addendum implements Addendum f to Standard 62.1- 2016 and Addendum au to Standard 90.1-2016 to allow minimum rates to be calculated automatically from zone occupant-based and area-based ventilation rates.

Constructive comments are invited for the following public review drafts, which can be accessed on ASHRAE’s website.

All activity for reviewing and commenting on public review drafts can be accomplished completely online. To obtain a paper copy of any Public Review Draft contact:


Attn: Standards Public Review

1791 Tullie Circle NE

Atlanta, GA 30329-2305

or email

Paper copies are available for $35/copy if 100 pages or fewer and $45 if more than 100 pages.