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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Proposed Rules
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electronically should be provided in PDF preferred, Microsoft Word or Excel, WordPerfect, or text ASCII file format. Provide documents that are not secured, that are written in English, and that are free of any defects or viruses.
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Pursuant to 10 CFR 1004.11, any person submitting information that he or she believes to be confidential and exempt by law from public disclosure should submit via email two well-marked copies: One copy of the document marked confidential including all the information believed to be confidential, and one copy of the document marked non-confidential with the information believed to be confidential deleted. DOE
will make its own determination about the confidential status of the information and treat it according to its determination.
It is DOEs policy that all comments may be included in the public docket, without change and as received, including any personal information provided in the comments except information deemed to be exempt from public disclosure.
E. Issues on Which DOE Seeks Comment Although DOE welcomes comments on any aspect of this proposed determination, DOE is particularly interested in receiving comments and views of interested parties concerning the following issues:
1 DOE requests data and information related to achievable R-values of polyurethane foam insulation on jacketed UFHWSTs at thicknesses above 3 inches. DOE also seeks comment on its understanding of the difficulties associated with applying more than 3
inches of foam to jacketed UFHWSTs.
2 DOE seeks comment on the considered efficiency levels analyzed for UFHWSTs. Additionally, DOE seeks comment on its assumption that polyurethane foam has an R-value per inch of 6.25, up to a maximum thickness of 3 inches.
3 DOE requests comment on the inputs and assumptions used in its engineering analysis. In particular, DOE
requests input on its choice of representative volumes, its assumptions
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about the typical coverage of various insulation materials, and its estimated R-values for each insulation material at each EL considered.
4 DOE requests comment on the appropriateness of its assumption regarding the use of a constant internal water temperature of 140 F.
5 DOE requests comment on its assumption regarding the typical ambient temperatures for UFHWSTs installed indoors and outdoors.
6 DOE requests comment on its assumption that 10 percent of all UFHWST would be installed outdoors.
DOE requests information on the typical capacities and R-values of outdoor equipment.
7 DOE requests comment on its assumption that outdoor installations would be limited to climate zones 1A, 2A, and 2B. DOE requests information or data on the fraction of installations that occur within these, or other, climate zones.
8 DOE requests comment on its Tank Thermal Loss Model.
9 DOE requests data and information which can be used to estimate installation costs of UFHWSTs with modified dimensions.
10 DOE requests information and data characterizing the types of buildings where installation difficulties are likely to occur and to lead to increased installation cost, as well as the frequency with which such installation problems may arise.
11 DOE requests information and data characterizing the average installation costs for UFHWSTs at all different storage volumes.
12 DOE requests information and data characterizing the circumstances that would drive the decision to potentially restructure existing building spaces, including doorways and mechanical rooms, when installing a replacement UFHWST. For example, is the decision driven by a minimum building code requirement for door openings?
13 DOE requests comments generally regarding its stock analysis for UFHWSTs.
14 DOE requests comment regarding its assumption that there would be only one UFWHST per building.
15 DOE requests comment regarding its disaggregation of UFHWST stock by sector.
16 DOE requests comment on its assumption that UFHWSTs are not used for industrial process hot water storage.
17 DOE requests comment on its assumption of a 12-year lifetime for UFHWSTs similar to commercial electric hot water storage tanks.

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18 DOE requests comment on its use of AEO 2021 trends as a scaler to project shipments to new construction.
19 DOE requests comment on its distribution of shipments by storage volume, and on its assumption that the distribution of shipments by storage volume does not change over time.
20 DOE requests comment regarding its applied efficiency distribution that 99 percent of all units sold are currently at baseline R12.5.
VIII. Approval of the Office of the Secretary The Secretary of Energy has approved publication of this notification of proposed determination.
Signing Authority This document of the Department of Energy was signed on June 3, 2021, by Kelly Speakes-Backman, Principal Deputy Assistant Secretary and Acting Assistant Secretary for Energy Efficiency and Renewable Energy, pursuant to delegated authority from the Secretary of Energy. That document with the original signature and date is maintained by DOE. For administrative purposes only, and in compliance with requirements of the Office of the Federal Register, the undersigned DOE Federal Register Liaison Officer has been authorized to sign and submit the document in electronic format for publication, as an official document of the Department of Energy. This administrative process in no way alters the legal effect of this document upon publication in the Federal Register.
Signed in Washington, DC, on June 3, 2021.
Treena V. Garrett, Federal Register Liaison Officer, U.S.
Department of Energy.
FR Doc. 202111957 Filed 6921; 8:45 am BILLING CODE 645001P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210459; Project Identifier MCAI202100129T
RIN 2120AA64

Airworthiness Directives; Gulfstream Aerospace LP Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for
SUMMARY:

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