ANSI NFRC 100-2026 确定门窗产品U值（U-factors）的程序 Procedure for Determining Fenestration Product U-factors

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ANSI/NFRC 100-2026[E0A0] Page

ANSI/NFRC 100-2026[E0A0]

Procedure for Determining

Fenestration Product U-factors

An American National Standard

Council, Inc.

Prepared by:

National Fenestration Rating Council

6305 Ivy Lane, Suite 410

Greenbelt, MD 20770

P: 301-589-1776

F: 301-589-3884

E: info@nfrc.org

W: www.nfrc.org

ANSI/NFRC 100-2026[E0A0] Page i

FOREWORD

The National Fenestration Rating Council, Incorporated (NFRC) has developed and

operates a uniform rating system for energy and energy-related performance of

fenestration products. The Rating System determines the U-factor, Solar Heat Gain

Coefficient (SHGC) and Visible Transmittance (VT) of a product, which are mandatory

ratings for labeling NFRC certified products, are mandatory ratings for inclusion on label

certificates, and are supplemented by procedures for voluntary ratings of products for Air

Leakage (AL), and Condensation Resistance. Together, these rating procedures, as set

forth in documents published by NFRC, are known as the NFRC Rating System.

The NFRC Rating System employs computer simulation and physical testing by NFRC-

accredited laboratories to establish energy and related performance ratings for

fenestration product types. The NFRC Rating System is reinforced by a certification

program under which NFRC-licensed responsible parties claiming NFRC product

certification shall label and certify fenestration products to indicate those energy and

related performance ratings, provided the ratings are authorized for certification by an

NFRC-licensed certification and Inspection Agency (IA).

The requirements of the rating, certification, and labeling program (Certification Program)

are set forth in the most recent versions of the following as amended, updated, or

interpreted from time to time:

• NFRC 700 Product Certification Program (PCP).

• NFRC 705 Component Modeling Approach (CMA), Product Certification Program

(CMA-PCP).

Through the Certification Program and the most recent versions of its companion

programs as amended, updated, or interpreted from time to time:

• The laboratory accreditation program (Accreditation Program), as set forth in the

NFRC 701 Laboratory Accreditation Program (LAP).

• The IA licensing program (IA Program), as set forth in NFRC 702 Certification

Agency Program (CAP).

• The CMA Approved Calculation Entity (ACE) licensing program (ACE Program), as

set forth in the NFRC 708 Calculation Entity Approval Program (CEAP).

ANSI/NFRC 100-2026[E0A0] Page ii

NFRC intends to ensure the integrity and uniformity of NFRC ratings, certification, and

labeling by ensuring that responsible parties, testing and simulation laboratories, and IAs

adhere to strict NFRC requirements.

In order to participate in the Certification Program, a Manufacturer/Responsible Party

shall rate a product whose energy and energy-related performance characteristics are to

be certified in accordance with mandatory NFRC rating procedures. At present, a

Manufacturer/Responsible Party may elect to rate products for U-factor, SHGC, VT, AL,

Condensation Resistance, or any other procedure adopted by NFRC, and to include

those ratings on the NFRC temporary label affixed to its products, or on the NFRC Label

Certificate. U-factor, SHGC and VT, AL, and Condensation Resistance rating reports

shall be obtained from a laboratory that has been accredited by NFRC in accordance

with the requirements of the NFRC 701.

The rating shall then be reviewed by an IA which has been licensed by NFRC in

accordance with the requirements of the NFRC 702. NFRC-licensed IAs also review

label format and content, conduct in-plant inspections for quality assurance in

accordance with the requirements of the NFRC 702, and issue a product Certification

Authorization Report (CAR), or approve for issuance an NFRC Label Certificate for site-

built or CMA products and attachment products. The IA is also responsible for the

investigation of potential violations (prohibited activities) as set forth in the NFRC 7007

Compliance and Monitoring Program (CAMP).

Ratings for products that are labeled with the NFRC Temporary and Permanent Label, or

products that are listed on an NFRC Label Certificate in accordance with NFRC

requirements, are considered to be NFRC-certified. NFRC maintains a Certified Products

Directory (CPD), listing product lines and individual products selected by the

manufacturer/responsible party for which certification authorization has been granted.

NFRC manages the Rating System and regulates the Product Certification Program

(PCP), Laboratory Accreditation Program (LAP) and Certification Agency Program (CAP)

in accordance with the NFRC 700 (PCP), the NFRC 701 (LAP), the NFRC 702 (CAP),

the NFRC 705 (CMA-PCP), and the NFRC 708 (CEAP) procedures, and conducts

compliance activities under all these programs as well as the NFRC 7007 (CAMP).

NFRC continues to develop the Rating System and each of the programs.

NFRC owns all rights in and to each of the NFRC 700, NFRC 701, NFRC 702, NFRC

705, NFRC 7007, NFRC 708 and each procedure, which is a component of the Rating

System, as well as each of its registration marks, trade names, and other intellectual

property.

The structure of the NFRC program and relationships among participants are shown in

Figure 1, Figure 2, and Figure 3. For additional information on the roles of the IAs and

laboratories and operation of the IA Program and Accreditation Program, see the NFRC

700 (PCP), NFRC 701 (LAP), and NFRC 702 (CAP) respectively.

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摘要：

本页面详细介绍ANSI NFRC 100-2026标准，即美国国家门窗评级委员会（NFRC）发布的最新门窗产品U值（U-factors）测定程序。该标准首次发布于1991年，2026年版为最新修订版，规定了在标准化条件下评估门窗、天窗、幕墙等透光产品热传导性能的完整方法。U值代表热量通过单位面积、单位温差时传递的速率，数值越低表明隔热性能越好。文档涵盖热箱测试设置、边界条件定义、计算模型及合规性要求，适用于北美建筑能效法规遵循、产品认证及建筑节能设计。该标准对建筑门窗企业、能效审计人员、暖通工程

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