The NFRC Product Certification Program

NFRC certification gives consumers the assurance that your product has been rated by the world’s foremost expert in window, door, and skylight performance, in addition to ensuring compliance. Plus, it gives your product added visibility in the marketplace by being listed in the NFRC Certified Product Directory.

11-Step Product Certification Process

1. Review the NFRC 700, Product Certification Program document.

NFRC 700-2021 (pdf) outlines guidelines and program requirements to participate and achieve product certification.

2. Choose your License Agreement Category based on your company’s product and practices.

Manufacturer – a participant that manufactures whole fenestration products such as windows, doors, skylights, etc.

Fabricator – a participant that manufactures windows from lineal suppliers’ reissued test reports.

Site-Built – a participant that manufactures products but assembles and glazes the products onsite.

Door Manufacturer/Lineal Supplier – a participant that manufactures door components and is not responsible for finished glazing on door, and supplies simulation/validation testing to assembler/distributor.

Door Distributor/Dealer – for a door distributor/purchaser or dealer/pre-hanger that receives testing and simulation reports from a door manufacturer/pre-hanger or door manufacturer/lineal supplier.

Door Manufacturer/Pre-Hanger – a participant that manufactures, glazes, and pre-hangs a door product (includes slab, jamb, header, and threshold). The participant obtains certification authorization for their door products in accordance with NFRC rating and certification requirements.

Applied Film – a participant that manufactures attachment products for fenestration products.

Private Labeler – a participant that is the Responsible Party whose name and identification code is reflected on the NFRC Label of a fenestration product and whose name is listed in the NFRC CPD. A Private Labeler’s fenestration product’s certification authorization is maintained by the fenestration product Manufacturer.

3. Sign and return all of the required documents: NFRC License Agreement, schedules, and associated documents.

Once NFRC receives all required documents, a record only visible to the IA and labs is created in the NFRC Certified Products Directory (CPD) participant database.

4. Select an NFRC-licensed Inspection Agency (IA)

An IA is an organization or person authorized by the NFRC to conduct specified services for the Product Certification Program. Your IA will guide you through the process.

5. Select an NFRC Insulating Glass Certification Program

Each licensee shall use insulating glass units certified by a third party participating in NFRC’s IG certification program.

6. Select an NFRC accredited simulation lab and test lab.

The simulation lab and test lab will work with you to review your product catalog and determine the number of product lines to be rated based on the requirements of NFRC standards (typically representing operator type, frame type, etc.).

7. Test your selected product lines.

Our simulator models your product(s) and determines the energy performance characteristics (U-factor, Solar Heat Gain Coefficient, and Visible Transmittance). Ask the labs to guide you through specific requirements.

TIP: Do not begin any testing until your product matrix is established.

8. Send a baseline product to the NFRC accredited test lab.

Baseline products vary in accordance with the results of products simulated. Verify the baseline product to be tested with the simulation laboratory. The test lab will validate the U-factor rating from the NFRC-accredited simulation lab results.

9. Receive your results from the test and simulation labs.

Both labs will send copies of your test results to your IA. Your IA will review the results and compare them to the original drawings and specifications submitted by your accredited labs.

10. Await approval from your IA.

Once the IA determines that the product meets NFRC requirements, they will issue a Certification Authorization Report (CAR) to you.

11. Label those product(s) with an NFRC label approved by your IA.

NFRC will return a counter-signed license agreement and issue your initial participation invoice based on the date of your initial certification.

NFRC Participation Costs

Your costs are based on annual participation, product line fees, and labeling frees. For exact participation fees, see our Fee Schedule (pdf).

Visit the NFRC membership page to see how becoming a member could benefit your company.

Visit the ENERGY STAR® Verification page and learn about how to become an ENERGY STAR Partner.

Commonwealth Laminating and Coating, Inc.
CPFilms, A Unit of Solutia
Hanita Coatings RCA Ltd
Johnson Laminating & Coating, Inc.
Madico, Inc.
Saint-Gobain Solar Gard LLC
Southwall Technologies
9116-8641 Quebec Inc.
92976836 Quebec Inc.
A Window, Inc.
A&M Vinyl Windows LLC
A.B.A. Fenestration Inc.
A.J. Manufacturing, Inc.
ABC Window Systems
Abritek Windows and Doors
Acadia Windows and Doors
ACAN Windows Inc.
Accent Windows
Accurate Dorwin Ltd.
Acorn Deck House Company by Trudeau Homes Int’l.
Acurlite Structural Skylights, Inc.
Adurra Door and Windows
Advanced Window Corp.
AG Millworks – Art Glass Etc., Inc.
Air Master Awning Inc.
Airtite Products LLC
Albany Door Company, Inc.
Alberta Vinyl Window Designs Ltd.
Albertini S.P.A
All New Glass, Inc.
All Seasons Door and Window
All Seasons Window & Door Manufacturing, Inc.
All Steel Windows and Doors
All Weather Architectural Aluminum
All Weather Windows Ltd.
Allan Window Technologies
Allsco Building Products Corp.
Alpen HPP, LLC dba Alpen High Performance Products
Altek Portes & Fenetres (8528853 Canada Inc.)
Alton Windows and Doors Limited
Alumico Architectural, Inc.
Aluminart Architectural, Inc.
Aluminium DI FRANCO 2000
Aluminum Caruso & Fils Inc.
Aluminum St. Viateur ltee.
American Building Supply
American Exteriors LLC
American Jewel Window Systems
American Openings
American Window Alliance, Inc.
Amerimax Building Products, Inc.
Ameristar Windows, Inc.
Ameritech Millworks, LP
Amsco Windows
Andersen Corporation
Anderson Windows
Anig Window Manufacturing, Ltd.
Anlin Industries
Apollo Building Products, Inc.
Arcadia Custom
Arcadia, Inc.
Architectural Glass & Aluminum Company
Architectural Iron Works
Arcor Windows & Doors, Inc.
Arlene Stained Glass and Door Co., L.P.
Armwood Windows and Doors
Artistic Doors and Windows Manuf., LLC.
Associated Materials, Inc.
Astec USA
Astra Fenestration Inc.
Atis Doors and Windows Corp.
Atlantic All-Weather Windows
ATN Window & Door Corporation
Atrium Companies, Inc.
Atwood Mobile Products
Auroral Portes et Fenetres
Austrian Style Woodwork, Ltd.
Avanti Industries, LLC
AWP Windows and Doors, LLC
B.F. Rich Company
Bayer Built Woodworks
Beechworth Windows LLC
Belisle Ancestral Windows and Doors
Bel-R Portes Et Fenetres
Benalex Window & Door Mfg. Corp.
Bend River Sash and Door
Benson Industries, Inc.
Best Window and Door Company
Bestline Sash and Door
BGroup 3 Inc. DBA Fen-Tech
Bildau & Bussmann North America
Blomberg Window Systems
Bonelli Enterprises
Boston Sash & Millwork, Inc.
BP – Glass Garage Doors & Entry Systems
Bristolite Daylighting Systems
Brockway-Smith Co.
Brombal USA
Brouillette Portes et Fenetres, Inc.
Builders FirstSource
Builders Specialties Supply, Inc.
Burris Windows
C. T. Windows Inc.
California Deluxe Windows Industries, Inc.
Canada Windows and Doors
Canadian Vinyltek Window Corporation
Caoba Doors
Capitol Glass/Northerm Windows
Caron et Guay
Cascade Windows
Casco Industries
Cayman Manufacturing, Inc.
CBW Windows and Doors
Centennial Windows
Centor North America Inc.
CGI Windows and Doors
Champion Window and Patio Room Company
Chinook Windows
CITADEL Window and Door, LLC
Classee Vinyl, Inc.
Clayton Windows
Clearview Industries Limited
Climate Solutions Corp.
Clopay Building Products Company
Coast To Coast Mfg., Inc.
Coastal Industries, Inc.
Cobra Doors 2000 Ltd.
Codel Entry Systems, Inc.
Coeur D’Alene Window Company
Columbia Commercial Building Products, LLC
Columbia Glass & Window
Columbia Manufacturing Co., Ltd.
Comfort Design Windows & Doors
Comfort Line, Inc.
Comfort View Products, LLC
Comfort Windows Manufacturing
Commonwealth Laminating and Coating, Inc.
Compass Construction Management
Concept Mat, Inc.
Continental Window & Glass
Coronet Window Company
Correia Windows & Doors
CPFilms, A Unit of Solutia
CPI Daylighting
Creative Engineering Solutions DBA Panoramic Doors
Crest Doors
Croft LLC
Crown Windows and Vinyl Products, Inc.
Crystal Pacific Window & Door System, Inc
Crystal Window & Door Systems, Ltd.
CrystaLite, Inc.
CTW (Nuview/Magic Window)
Custom Designed Systems, Inc.
Custom Direct Window Ltd.
Custom Vinyl Products, LLC
Custom Window Systems, Inc.
Customer Choice Windows & Doors. Inc.
Dalmen Windows and Doors
Danjo Windows & Doors
Dasan Glass & Windows
Dayliter Skylights
Dayside Industries, Ltd.
DBP Partners Ltd.
Dealers Supply & Lumber Co., LLC
Del Windows & Doors Inc.
Deluxe Windows
Diamond Windows and Doors Mfg.
Dimensions Portes et Fenetres, Inc.
Dionne Architectural
Doers Window Mfg.
Don Young Company
Don’s Windows & Doors, Inc.
Door Way
Dorplex Industries Limited
Duke Vinyl Products
Dunbarton Corporation
Duo-Gard Industries
Durabuilt Windows & Doors
Duratherm Window Corporation
Dusco – A Licensee of Stanley Black & Decker
Duxton Windows and Doors
DW Distribution Inc.
Dyke Industries Inc.- Atlanta
Dynamic Glass, Inc.
Dynamic Windows & Doors, Inc.
Eagle View Windows
Eagle Window and Door, Inc.
Earthwise Group, LLC
East Bay Glass
East Coast Doors Mfg. Ltd.
Eastern Architectural Systems
Eastside Glass and Paint Company
Eco Window Systems, LLC
ECO Windows LLC
EFCO, a Pella Company
EL & EL Wood Products
Elba Windows & Doors
Elite Solar Systems, Inc.
Elite Vinyl Windows
Emerald Glass, Inc.
Enclos Corp.
Energex Window Alliance
EnergyWall Window & Door
Entreprises Doco, Inc.
Entryguard Doors, Inc.
Erickson International LLC
ESWindows LLC
ETO Doors, Corp.
Euro Cabinet Design & Wood Working Corp.
Euro Vinyl Windows & Doors Inc.
Eurolegno S.r.l.
Euroline Steel Windows & Doors
Euroline Windows Inc.
Evergreen House
Extreme Window & Entrance Systems
Fakro SP.ZO.O
Fast Windows & More, Inc.
FCI Windows
Fenergic, Inc.
Fenestral, Inc.
Fene-Tech, Inc.
Fenetres AGM (2015) Inc.
Fenetres Concept
Fenetres Gaspesiennes, Inc.
Fenetres Jalmo
Fenêtres Lajeunesse
Fenetres Lapco, Inc.
Fenetres LeFrancois
Fenetres Magistral Windows, Inc
Fenetres Metric Inc.
Fenetres Polyco Inc.
Fenetres St. Paul, Inc.
Fenetres Super Seal Windows, Inc.
Fenetres Unique Windows Inc.
Fenextras Beauce Inc.
Fenomax (Gestion Poudrier Inc.)
Fenplast Inc.
Fibertec Window & Door Mfg.
Filink Co., Ltd.
Fiset et Marcotte Inc.
Fleetwood Windows & Doors
Form-Tech, Inc.
Four Seasons Solar Products, LLC
Frontline Building Products Inc.
Futura Portes & Fenetres
G. R. Theriault, Ltd.
Gaulhofer Industrie-Holding GmbH
Gentek Building Products
Gerard Milette, Inc.
Gienow Canada / Plygem
Giguere Portes et Fenetres, Inc.
Gilkey Window Company
Gilles Girard et Fils, Inc.
Gilwin Company
GIT Portes et Fenetres
Gladstone Custom Door Systems
Glass Rite
Glass Technologies, LLC
Glasscraft Door Co.
Global Technologies Window Mfg. Ltd.
Global Windows & Doors
Golden Windows Ltd.
Goldfinch Brothers, Inc.
Graber Supply, LLC
Grabill, Inc.
Graham Architectural Products
Great Day Improvements LLC Stanek Windows
Great Lakes Window, Inc.
Green Wave Window & Door Manufacturing Corp.
Green World Windows
Group Wilton Panorama
Groupe Atlanta Inc.
GWD, Ltd. dba Gerkin Windows & Doors
H Window Company, LLC
H.K. Windows
Hanita Coatings RCA Ltd.
Harry G. Barr Company
Harvey Industries, Inc.
Hayfield Window and Door Co.
Heartland Windows Manufacturing Co.
Heritage Portes et Fenetres Inc.
HH Windows & Doors
HM Group USA
Home Guard Industries
Home’s Exclusive Entrance Systems
Hope’s Windows, Inc.
Household Metals, Inc.
Humphrey Products of Winnipeg Ltd.
Hurd Windows & Doors, Inc.
Husky Portes et Fenetres Inc.
Ideal Window Manufacturing
Inline Fiberglass Ltd.
Innotech Windows & Doors Inc.
Innovation Windows LLC
Innovative Building Products
Innovative Window Concepts LLC
International Product Supply
International Window Corporation
Interstate Building Materials, Inc.
Intus Windows
J & A Windows
J & M Glass Company Inc.
J & S Windows Corporation
J. E. H. Windows & Doors Ltd.
Jangho Curtain Wall Co., Ltd.
Jantek Industries, LLC
JB Sash and Door Company, Inc.
Johnson Laminating & Coating, Inc.
Jones Paint & Glass, Inc.
Joyce Manufacturing Co.
K & C Industries, Inc.
Kalwall Corporation
Kasson & Keller, Inc.
KDL Enterprises (Western Skylights)
Kehl Window Systems, Inc.
Kennedy Skylights DBA Natural LIght Energy Systems
Kensington HPP, Inc.
Kento, Ltd.
Kneer GmbH Fenster und Turen
Kohltech International, Ltd.
Kolbe & Kolbe Millwork Co., Inc.
KP Building Products Limited
Kramer Window Company
Krestmark Industries L. P.
Kudzu Millwork, Inc.
KV Custom Windows & Doors
L.A.S. Enterprises
La Cantina Doors
La Loma Windows & Doors
Laflamme Doors & Windows, Inc.
Lawson Industries
LCG Facades
Legacy Building Products
Legacy Vinyl Windows L.P.
Lepage Millwork
Les Ateliers Jean Cyr, Inc.
Les Chassis Nigadoo Ltee
Les Entreprises A. M.
Les Entreprises Marchand Ltee
Les Fenetres 2000, Inc.
Les Fenetres Cameleon
Les Fenetres Cote
Les Fenetres Elite, Inc.
Les Fenetres Enerco, Inc.
Les Fenetres Horizon
Les Fenetres Quebecoises, Inc.
Les Fenetres Rejean Tremblay, Inc.
Les Menuiseries Philibert
Les Portes A.R.D Inc.
Les Portes Alain Bourassa Inc.
Les Portes Decko, Inc.
Les Portes et Chassis Eddy Boulet, Inc.
Les Portes et Fenetres J Lacroix et Fils Inc.
Les Portes et Fenetres Ocean Inc.
LIDO Windows and Doors
Lincoln Wood Products, Inc.
Lindal Building Products
Lippert Components, Inc. dba Kinro Windows
Lockheed Window Corp.
Loewen Windows
Lorendo, Inc.
Lowe’s Home Centers, Inc.
Madico, Inc.
Magnolia Window and Door
Major Industries
Manic Aluminium Ltee
Manion’s Wholesale Building Supplies
Manko Window Systems, Inc.
Marcoux et Frere
Maritime Door and Window, Ltd.
Marlin Windows
Martin Portes et Fenetres
Martindale Window & Door Inc.
Marvin Windows and Doors
Masonite International Corporation
Master Ironworks LLC
Mastercraft by Midwest Manufacturing
Mastic by Ply Gem
Mathews Brothers Company
Mayfair Window & Door Company
McCoy’s Building Supply
McMahon and Company
Meagi Windows and Doors, Inc.
Meloche Windows, Inc.
Menuiserie Abitibi Inc.
Menuiserie Basque & Fils Ltee
Menuiserie Bolduc, Inc.
Menuiserie Desmeules, Inc.
Menuiserie J. Touchette Inc.
Menuiserie Lionel Cormier Ltee
Mercer Industries, Inc.
Mercier et Freres
Mercury Excelum, Inc.
Merrill Millwork, Inc.
Metal Window Corporation
MGM Industries
MI Windows and Doors, Inc.
Mid Am Building Supply
Midas Export USA Corp.
Milgard Manufacturing, Inc.
Milliken Millwork, Inc.
Millwork Products, LLC
Minnkota Windows
Mission Glass, LLC
MK Architectural Metal, Inc.
Monarch Materials Group, Inc.
Monarch Windows and Doors
Moss Supply Company
Multi-Fenetres 2000
N.A.P. Windows and Doors, Ltd.
Nan Ya Plastics Corporation / Neuma Door
Nana Wall Systems, Inc.
National Vinyl, LLC
Natural Light Energy Systems, LLC
New Concept Quality Doors Ltd.
Newmar Window Manufacturing Inc.
NewSouth Window Solutions
Nipissing Siding & Windows Ltd.
Noble PVC Products & Manufacturing, Inc.
North Star Manufacturing (London) Ltd.
Northair Window and Door, Ltd.
Northeast Building Products Corporation
Northeast Windows USA, Inc.
Northstar Woodworks Inc.
Norwood Classic Window and Entrance System
Nova Doors and Windows, Ltd.
Novatech Patio Door Inc.
Novum Structures, LLC
NT Window, Inc.
Nu-Vue Window Factory
OceanView Patio Doors LTD.
ODL, Inc.
OKNA Windows & Doors Mfg.
Oldcastle BuildingEnvelope
Omega Windows
Origin USA Inc.
Ostaco 2000 Windoors Ltd.
Ouellet Portes et Fenetres, Inc.
Owens Corning
P H Tech Corp.
P. E. Perusse et Fils, Inc.
P.F. Expert Inc.
Pacific Architectural Millwork
Palms To Pines Mirror & Glass
Panda Windows & Doors
Paradigm Window Solutions
Paradis Portes et Fenetres, Inc.
Paragon Door Designs, Inc.
Paramount Windows Inc.
Parco Manufacturing, Inc.
Parrett Manufacturing, Inc.
Pella Windows and Doors
PGT Industries
PH Tech Inc.
Pierre Naud, Inc.
Pioneer Cladding & Glazing
Pioneer Window and Door Mfg Ltd.
Piva Group North America, LLC
Piva Group SPA
Plastpro Inc.
Ply Gem Window Group
Plyco Corporation
Polaris Technologies, Inc.
Pollard Windows
Portatec (2795604 Canada Inc.)
Porte Et Fenetre Imperial Inc.
Porte R.S. 2008 Inc.
Portella Industries LLC
Portes & Fenetres Vallee Inc.
Portes alumican Inc.
Portes Et Fenetres BM Inc.
Portes et Fenetres Dicaire Inc.
Portes et Fenetres Ebi-Tech Inc.
Portes et Fenetres Isothermic
Portes Et Fenetres JM Ferron ENR
Portes et Fenetres Kompact Inc.
Portes et Fenetres LGC, Inc.
Portes et Fenetres Nouvel Horizon, Inc.
Portes et Fenetres Polair 3
Portes et Fenetres President, Inc.
Portes et Fenetres Varin Inc.
Portes Metalliques Jacob, Inc.
Precise Forms, Inc.
Precision Millworks, Inc.
Precision Portes D’Acier
Premium Windows
Prestige Window & Door Ltd.
Preville Vision Confort
Pro Windows and Doors Ltd.
ProBuild Holdings
Produits De Fenestration Artik, Inc.
Pro-Expert Portes et Fenetres Inc.
Profenex Inc.
Prolight Windows and Doors
ProVia Door
PVC Industries, Inc.
Quaker Window Products
Qualiglass Windows and Doors Ltd.
Quantum Windows and Doors, Inc.
Quest Window Systems Inc.
R. Lang Company
Rae-Lite Industries Ltd
Raining Threes, LLC
Ram Industries Inc.
Ready Access
Regal Windows & Doors Systems, Inc.
Regency Plus, Inc.
Reliance Windows, Inc.
Remodelers Supply Center
Renovation du Saguenay
Republic Windows and Doors, Inc.
Retro Teck Window Mfg. Ltd.
Reynaers Aluminium N.V.
Ringer Windows, Inc.
Riviera Bronze Mfg
Roberge & Fils
Robert Bowden, Inc.
Rocco Building Supplies, LLC.
Roger’s Windows – CA
Rogers Windows, Inc. – KY
Rogue Valley Door
Roma Aluminum Co., Inc.
Rosati Windows
Ross Windows and Doors
Rossi Windows dba Ventana Aluminum Manufacturing Co., Inc.
Royal Aluminum Company
Royal Glass Company
Royal Window and Door Profiles/Dominion Div. Plant #1
Royal Window and Door Profiles/Ultimate Div. Plant #2
Royal Windows and Doors Profiles / Royalplast Plant#10
Saint-Gobain Solar Gard LLC
Sangbo Corporation
Scheel Window Limited
Seaway Manufacturing Corporation
Sellmore Industries, Inc.
Semling-Menke Co.
Serious Energy, Inc.
Seven D Industries
Shelter Products, Inc.
Shenyang Yuanda Aluminum Industry & Engineering Co. Ltd.
Showcase Custom Vinyl Windows & Doors, An Enlight Industries
Shwinco Architectural Products LLC
Sierra Pacific Windows
Sierra Woods, Inc.
Signature Industries, Inc.
Silver Line Building Products
Simonton Building Products, Inc. – Simonton Windows
Simpson Door Company
Sky-Frame Inc.
Skyreach L&S Extrusion Corp.
Soft-Lite Gorell, LLC
Soft-Lite, LLC
Solar Industries, Inc.
Solar Innovations, Inc.
Solaris International, Inc.
Solatube International, Inc.
Sound Control Systems
Sound Solutions Windows & Doors LLC
Southern Shade WIndow & Door Inc.
Southfield Windows and Doors, Inc.
Southland Windows, Inc.
Southwall Technologies
Southwest Vinyl Windows, Inc.
Specialty Wholesale Supply
St. Albans Window Mfg.
Standard Doors, Inc.
Starline Architectural Windows Ltd.
Starline Windows (2001) Ltd
Steelworks Etc., Inc.
Stephens Building Supplies div of Joneljim Investments, Ltd.
Sterling Window Systems, Inc.
Stock Building Supply – Doors
Strassburger Windows & Doors Ltd.
Styleline Door & Window Systems, Inc.
Summit Specialty International LLC
Sun Windows, Inc.
Sunoptics Prismatic Skylights
Sunrise Windows, Ltd.
Sun-Tek Industries
Sunview Patio Doors Ltd.
Sunview Windows (Newco Building Supplies, Inc.)
Sunview Windows Doors & Glass
Superior Metal Products LLC
Superior Window Manufacturing, Inc.
Superior Windows & Doors
Superseal Windows & Doors
Supreme Skylights Inc.
Synergy Mfg. Inc
Target Windows and Doors
Tashco Industries, Inc.
Taylor Entrance Systems
Taylors Window and Screen, Inc.
Technical Glass Products
Tempco Products Company
Tempest Architectural Products, Inc.
Tensoforma Trading srl
Tex-Star Windows, Inc.
The Door Store of America, Inc.
The Folding Sliding Door Company LLC
The Home Door Inc.
The Window Factory, Manitoba Limited
Thermal Edge Inc.
Thermal Industries, Inc.
Thermal Windows, Inc.
Therma-Tru Corporation
Thermo Visus Systems Ltd.
Thermolite, Inc.
Thermos Vizion Inc
Thermo-Tech Windows
Thermo-Twin Industries, Inc.
Thompson Creek Window Company
THV Compozit Windows and Doors
Tiltco Division of Windoworld Industries, Inc.
TM Windows L.L.C.
Toiturex, Inc.
Toro Aluminum
Torrance Steel Window Co., Inc.
Trillium Window & Door Systems
Trimline Windows, Inc.
Trinity Glass International
Tri-State Building Materials Corporation
Tri-State Window Factory Corp.
Trophy Windows LLC
TRU Architectural
Tru Tech Corporation
TRUST Windows Corp.
Tucker Door & Trim
Turnkey Millwork Inc
U.S. Aluminum Corporation
U.S. Block Windows
U.S. Window Factory – GA
Ultima Fenestration Inc.
Ultimate Windows, Inc.
Unilux AG
United Window & Door Mfg., Inc.
Unlimited, Inc.
Vaillancourt Inc.
Value Windows & Doors
Vector Windows
Ventana USA
Vezina Et Fils
Vinyl Design Corporation
Vinyl Kraft, Inc.
Vinyl Sash, Inc.
Vinyl Window Designs, Ltd.
Vinyl Window Technologies
Vinylmax LLC
Vinylume Products, Inc.
Vision Systems, Inc.
Vista Pointe Architectural Systems
Vista Window Company, LLC
Vistamark Enterprises, LLC
Vitrocsa USA (Division of Goldbrecht – USA)
Voyageur Door & Window
VPI Quality Windows
Vytex Corporation
W.E.H. Supply, Inc.
Wallside Windows
Walsh Building Products
Walters & Wolf
Wasco Products, Inc.
Washington Glass and Glazing
Wausau Window and Wall Systems
Weather King Windows & Doors Inc.
Weather Shield Mfg., Inc.
Weathergard Window Co., Inc.
Weiland Sliding Door and Windows, Inc.
Wellington Home Improvements
Werner Systems, Inc.
West Window Corporation
Westeck Windows
Western Window Systems, LLC
Western WIndows Alberta Ltd.
Westview Products, Inc.
Win-Can Windows & Doors
Winchester Industries
Wincore Window Company, LLC
Wind-Mar Supply
Windoor, Inc.
Win-Dor, Inc.
Window City Industries, Inc.
Window Craft, Inc. – WA
Window Mart
Window Tech Systems, Inc.
Window Technology, Inc.
WindowCraft, Inc. – TN
Windowcrafters, Inc.
Windsor Windows and Doors
Wojan Window and Door Corporation
YKK AP America, Inc.
Yoder Window & Siding LTD
Zeluck, Inc.
Zola Windows

Testing and Verification

NFRC products go through a series of physical tests designed to test the integrity of their energy performance versus NFRC standards.

Learn more about how products are tested and verified here.