HTL is accredited to perform testing for numerous organizations across
the country, including:

• AAMA - American Architectural Manufacturers Association
• Florida Building Code
• IAS - International Accreditation Service - PDF
• Miami-Dade County
• NFRC - National Fenestration Rating Council
• ISO 17025 Certificate - PDF

HTL is recognized by:

• Keystone Certification, Inc.
• TDI - Texas Department of Insurance
• WDMA - Window and Door Manufacturers Association

HTL is affiliated with:

• American Architectural Manufacturing Association
• American Society for Testing and Materials
• Glass Association of North America
• National Fenestration Rating Council