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Residential Weatherization and Ventilation Subcommittee Seeking RTF Direction on Ventilation and IAQ Requirements May 3 PowerPoint Presentation
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Residential Weatherization and Ventilation Subcommittee Seeking RTF Direction on Ventilation and IAQ Requirements May 3, 2011. The Residential Weatherization and Ventilation Subcommittee has been working on revising the RTF’s Weatherization Specifications (for months)

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Residential Weatherization and Ventilation SubcommitteeSeeking RTF Direction on Ventilation and IAQ RequirementsMay 3, 2011

Subcommittee: Residential Weatherization and Ventilation

background

The Residential Weatherization and Ventilation Subcommittee has been working on revising the RTF’s Weatherization Specifications (for months)

The subcommittee is making progress… BUT

We’ve high-centered on ventilation requirements and could use some input/guidance from the RTF.

(Further Background: Current ventilation requirements have some obvious inconsistencies.)

Background

Subcommittee: Residential Weatherization and Ventilation Specifications

subcommittee requests rtf guidance on

Primary Issue

  • Should ventilation/IAQ requirements be based on ASHRAE 62.2?
    • If not, then what?
  • Is the “mitigation only” (aka “delta”) approach to ventilation/IAQ appropriate?
  • If yes to 1, are the proposed "simplifications" of 62.2 ok?
  • Is the application of ventilation standards to only air-sealing as a measure and the PTCS duct sealing measure appropriate, given the proposal to study ventilation impacts of the other measures (insulation and windows)?
  • Should a maximum ventilation rate be specified?

Subcommittee Requests RTF Guidance On:

Subcommittee: Residential Weatherization and Ventilation Specifications

choosing a ventilation standard why not 62 2

Programs have been using standards other than 62.2 for years and don’t seem to be having major reported problems.

Too expensive to implement.

Too complicated.

Causes over-ventilation (wastes energy).

The industry, for the most part, has not yet adopted 62.2 – it may not be ready

There’s no proof 62.2 will cause better IAQ.

Its allowance for exhaust-only ventilation could cause IAQ to be worse.

Choosing a Ventilation Standard – Why not62.2?

Issue 1. 62.2 or not?

choosing a ventilation standard why 62 2

ASHRAE Standard 62.2 is thenationally recognized indoor air quality standard for residences.

  • 62.2 -2010 will be Required for US DOE Weatherization Assistance Programs as of 2012.
  • Referenced by EPA, CDC and HUD as the national guideline for IAQ.
  • RESNET and BPI have plans to align with 62.2.
  • Washington Department of Commerce moved away from 62-1989 toward 62.2-2004.
  • It was developed by the experts in the industry.
  • The old standards from ASHRAE are no longer valid, according to ASHRAE.

Choosing a Ventilation Standard – Why 62.2?

Issue 1. 62.2 or not?

is 62 2 the solution to iaq concerns

The following is from the “Scope” section of the standard:

2.2 While acceptable IAQ is the goal of this standard, it will not necessarily be achieved even if all requirements are met

Because of the diversity of sources and contaminants in indoor air and the range of susceptibility in the population;

Because of the many other factors that may affect occupant perception and acceptance of IAQ, such as air temperature, humidity, noise, lighting and psychological stress;

If the ambient air is unacceptable, and this air is brought into the building without first being cleaned (cleaning of ambient outdoor air is not required by this standard);

If the system(s) are not operated and maintained as designed;

When high-polluting events occur

Is 62.2 the solution to IAQ concerns?

Issue 1. 62.2 or not?

for wap action testing education training

Required for US DOE Weatherization Assistance Programs (WAP) as of 1/1/2012

ACTION/ALLOWABILITYVentilation 2010 (or most current) ASHRAE 62.2 is required be met to the fullest extent possible, when performing weatherization activity (must be implemented by January 1, 2012). Implementing ASHRAE 62.2 is not required where acceptable indoor air quality already exists as defined by ASHRAE 62.2. Existing fans and blower systems should be updated if not adequate

TESTING ASHRAE 62.2 evaluation, fan flow, and follow up testing are required to ensure compliance

CLIENT EDUCATIONProvide client with information on function, use, and maintenance of ventilation system and, components. Include disclaimer that ASHRAE, 62.2 does not account for high polluting sources or guarantee indoor air quality.

TRAININGASHRAE 62.2 training required including proper sizing, evaluation of existing and new systems depressurization tightness limits, critical air zones etc.

For WAP, Action, Testing, Education & Training

Issue 1. 62.2 or not?

ventilate at a mitigation level or at the full level

ASHRAE 62.2 seems to lend itself to determining a mitigation level of ventilation for weatherization measures.

  • 62.2-prescribed whole-house mechanical ventilation rates are dependent on:
  • Leakiness of the house (determined by blower door test)
    • Higher blower door number = less whole-house ventilation needed
  • Presence and effectiveness of spot ventilation (bath and kitchen fans)
    • Less spot ventilation = more whole-house ventilation needed
  • When performing house-tightening measures, a mitigation level of ventilation can be calculated
  • Mitigation Level =
  • Post-weatherization Ventilation Rate – Pre-weatherization Ventilation Rate

Ventilate at a “Mitigation” level, or at the full level?

Issue 2. Mitigation only, or full compliance with 62.2 (or another standard)

rtf decision or direction10

Are weatherization programs responsible for:

Leaving the house with compliant ventilation (ventilate to full level prescribed by the standard), or

Leaving the house with ventilation no worse than in the condition it was found (Mitigate only)?

RTF Decision or Direction

Issue 2. Mitigation only, or full compliance with 62.2 (or another standard)

proposed deviations from 62 2

The Big Deviations

Proposed Deviations from 62.2

Issue 3. Are the simplifications to 62.2 ok?

proposed deviations from 62 2 continued

Smaller Deviations

Proposed Deviations from 62.2, continued

Issue 3. Are the simplifications to 62.2 ok?

required when

The Subcommittee’s proposal is to require mechanical ventilation standards to be met when performing the following measures (on any residential building type):

  • Air-sealing (when performed “as a measure”)
  • PTCS Duct Sealing

Required When?

Issue 4. Plan for determining impact on “other” measures.

not required when

The Subcommittee’s proposal is to NOT require mechanical ventilation standards to be met when performing the following weatherization measures (on any residential building type):

  • Attic Insulation
  • Floor Insulation
  • Wall Insulation
  • Windows
  • BUT… The subcommittee acknowledges that reduction in infiltration rates are likely to occur with any of these measures.
  • The proposed insulation measure specifications have prescriptive air-sealing requirements that are identical to the “air-sealing as a measure” measure.
  • Why the inconsistency? ….

Not Required When?

Issue 4. Plan for determining impact on “other” measures.

why this inconsistency

The subcommittee believes:

Weatherization programs are not prepared to deal with the costs and complexities of performing blower door tests to determine whether ventilation mitigation is required.

It’s unclear how much the prescriptive air-sealing performed for the individual insulation measures and window measures will impact infiltration rates, and therefore, ventilation rates.

The subcommittee proposes the region test #2 and prepare for #1 within the next three years.

Why this Inconsistency?

Issue 4. Plan for determining impact on “other” measures.

research plan

Objective:

Determine the impact on the 62.2-recommended ventilation rate caused by insulation and windows measures.

Method:

Perform pre- and post- blower door tests to determine the mitigation ventilation rate for 5% of the insulation and windows installations over the next 2 years.

Research Plan

Issue 4. Plan for determining impact on “other” measures.

rtf decision or direction18

Is the application of ventilation standards to only air-sealing and duct sealing measures appropriate, given the proposal to study ventilation impacts of the other measures (insulation and windows)?

RTF Decision or Direction

Issue 4. Plan for determining impact on “other” measures.

maximum ventilation rate

Ventilation standards (like 62.2) specify minimum ventilation rates.

The subcommittee is concerned about the energy impacts of “over-ventilating” above the standard.

The proposal (assuming 62.2) would be to disallow installation of whole-house ventilation systems resulting in rates higher than 125% of the 62.2-prescribed rate.

Note: this factor would be applied to the equivalent continuous rate for intermittently operating whole-house systems

If the maximum requirement is omitted, contractors could simplify whole-house fan selection by assuming “worst-case” (very tight house with no spot ventilation) in all cases.

Maximum Ventilation Rate

Issue 5. Specifying a maximum ventilation rate?

the main questions repeated

Should ventilation/IAQ requirements be based on ASHRAE 62.2?

    • If not, then what?
  • Is the “mitigation only” (aka “delta”) approach to ventilation/IAQ appropriate?
  • If yes to 1, are the proposed "simplifications" of 62.2 ok?
  • Is the application of ventilation standards to only air-sealing as a measure and the duct sealing measure appropriate, given the proposal to study ventilation/IAQ impacts of the other measures (insulation and windows)?
  • Should a maximum ventilation rate be specified?

The Main Questions – Repeated:

Subcommittee: Residential Weatherization and Ventilation Specifications