Enter your name
Enter your company name
Enter your email
By submitting this form, you agree that Fry Reglet may contact you by email or phone for communication and marketing purposes. You can opt out at any time. Review our Privacy Policy for more details
 

Enter your name
Enter your company name
Enter your email
Enter your phone
Enter your address
Enter your city
Country*
Enter your country
United States
Canada
State*
Enter your state
Enter your zip
Enter your project description
Enter the product sample you're requesting
By submitting this form, you agree that Fry Reglet may contact you by email or phone for communication and marketing purposes. You can opt out at any time. Review our Privacy Policy for more details
 
Enter your name
Enter your email
Enter your phone
Enter your contractor name
Enter your project location
Project Type*
Enter your project type
Inquiry
New Project
Sample
 

Find a rep

Who are you*
Select who you are
Architect/Designer
Contractor/Installer
Distributor
Other
Country*
Select your country
United States
Canada
State*
Select your state
Product*
Select your product
Trims and Reveals
Wall Systems
LED & Lighting
Reglets & Flashing
Acoustical Metal Wall Panels
Column Covers
 

To view this form, please accept marketing cookies.

Thank you for your submission.

The Craft of Precision™

MullionFlex™ – Adjustable Partition Wall Closure System

MullionFlex™ closes the gap between exterior glazing systems (curtain wall, window wall, and storefront) and interior partition walls, with a clean, continuous transition. Two U-shaped aluminum extrusions encase an acoustic expansion foam core that automatically expands outward to fill the gap, with specialized tapes on both exterior faces to keep it in place.

Acoustic Performance Independent 3rd Party Lab-tested to ASTM E90
Cyclic Movement of Architectural Joints Independent 3rd Party Lab-tested to ASTM E1399
Cyclic Movement Class IV
“(Wind Sway, Thermal, Seismic)”
Fire Performance Non-combustible Aluminum
Foam meets the requirements of UL Standard for Safety UL 94

Why MullionFlex™

  • Installs faster and easier than field-fabricated closures, typically less than 5 minutes
  • Moves with the building, independently lab-tested to ASTM E1399 Cyclic Movement Class IV, accommodating lateral movement from wind sway, thermal expansion and contraction, and seismic activity
  • Reduces sound transfer between rooms, as shown with independent lab-tested STC ratings
  • Blends in with coatings or finishes that match the window mullions or interior walls for a virtually seamless look or explore our specialty finishes as well
  • Is covered by an enhanced warranty
  • Complies with Build America,Buy America Act requirements


PATENTED — U.S. PATENT NO. 12,442,181

Rapid Response Program

MullionFlex is supported by a speedy and predictable supply chain, helping installing contractors and architects keep projects on schedule.

Need MullionFlex fast? Through Fry Reglet’s Rapid Response Program, standard 10’ clear anodized or chem film MullionFlex ships within 3 days of order, and standard 6’ – 9’ clear anodized or chem film lengths ship within 5 days.*

Most importantly, it comes from Fry Reglet, a manufacturer the construction industry has trusted for decades to deliver quality architectural products. Human support is available from design through installation from 8 am ET to 5 pm PT (12 hours) each working day.

*Rapid Response orders are subject to stock availability and limited to 20 pieces per order. Orders placed by 10:00 a.m. PT ship within 3 business days for 10’ lengths and 5 business days for 6’ – 9’ lengths. Larger quantities should be quoted with customer service.

Products in the MullionFlex™ System

Resources

Need Pricing or Availability?

Contact a Sales Rep

Technical Questions?

Contact Us

Request a Sample

Request Sample

Keep in touch

Thank you for signing up.

Please refresh and try again.

Connect with us

Customer Service

© 2026 Fry Reglet Corporation, All Rights Reserved