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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
PATENTED — U.S. PATENT NO. 12,442,181

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

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

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