Mullion Mate® is an adjustable partition closure that creates the perfect transition between window mullions, windows, and partition walls.

Mullion Mate® is an adjustable partition closure that creates a seamless transition between window mullions (curtain walls), windows, and partition walls. Aesthetically pleasing, these spring-loaded partition closures bridge the gap to fit a variety of openings and provide excellent noise reduction up to 60 STC. Finished to match mullions, factory cut to length, and arriving to the jobsite pre-assembled, Mullion Mate’s ease of installation creates the solution to an everyday problem.

Design Attributes

  • For vertical junctions between partition walls and window mullions
  • Finished to match mullions
  • Clear, medium, or dark bronze anodized, and Champagne
  • Field paintable finish
  • Powder coated in standard or custom colors (AAMA2604/AAMA2605)
  • Custom Finishes available upon request
  • Factory spring loaded to fit a variety of opening sizes
  • Pre-assembled for ease of installation
  • Factory cut to desired height, maximum 192″
  • Optional Mullion Mate end cap to finish partition walls

Mullion Mate® Profiles

Series 60

  • Closes Gaps from 4” up to 8-1/2”
  • Double Mullion Mate® design surrounds the window mullion, increasing STC up to 60.
  • Patent Pending

Series 60 Sizes

Mullion Mate® 4 – 4″ minimum to 5-7/16″ maximum opening
Mullion Mate® 5.5 – 5-1/2″ minimum to 6-15/16″ maximum opening
Mullion Mate® 7 – 7″ minimum to 8-1/2″ maximum opening

Series 40

  • Closes Gaps from 2” up to 14”
  • Provides up to 56 STC

Series 40 Sizes

Mullion Mate® 2 – 2″ minimum to 2-15/16″ maximum opening
Mullion Mate® 3 – 3″ minimum to 3-15/16″ maximum opening
Mullion Mate® 4 – 4″ minimum to 4-15/16″ maximum opening
Mullion Mate® 5 – 5″ minimum to 6-15/16″ maximum opening
Mullion Mate® 7 – 7″ minimum to 8-15/16″ maximum opening
Mullion Mate® 9 – 9″ minimum to 14″ maximum opening

Series 30

  • Closes Gaps from 2” up to 14”
  • Provides up to 37 STC

Series 30 Sizes

Mullion Mate® 2 – 2″ minimum to 2-15/16″ maximum opening
Mullion Mate® 3 – 3″ minimum to 3-15/16″ maximum opening
Mullion Mate® 4 – 4″ minimum to 4-15/16″ maximum opening
Mullion Mate® 5 – 5″ minimum to 6-15/16″ maximum opening
Mullion Mate® 7 – 7″ minimum to 8-15/16″ maximum opening
Mullion Mate® 9 – 9″ minimum to 14″ maximum opening

Series 20

  • Closes Small Gaps from 1” up to 2”
  • Patent Pending

Series 20 Sizes

Mullion Mate® 1 – 1″ minimum to 1-7/16″ maximum opening
Mullion Mate® 1.5 – 1-1/2″ minimum to 2″ maximum opening

Partition Wall End Caps

Features & Benefits

Installation Options

Wall-to-Mullion

Wall-to-Glass

Wall-to-Glass
(Field Notch)

Videos

Finish Options

AAMA 2604 Powder Coat Finishes Download PDF

AAMA 2605 Powder Coat Finishes Download PDF

Antimicrobial Finishes

Green By Design

  • Products contribute to LEED® certification
  • In-House Finishes

Product Data

Mullion Mate® Series 60 Consolidated Set

Mullion Mate® Series 40 Consolidated Set

Mullion Mate® Series 30 Consolidated Set

Mullion Mate® Series 20 Consolidated Set

Mullion Mate® End Cap Details

Mullion Mate® Series 60 Specifications

Mullion Mate® Series 40 Specifications

Mullion Mate® Series 30 Specifications

Mullion Mate® Series 20 Specifications

Gap Closures for Fire Rated Walls

White Paper (STC Acoustics)

Brochure

Mullion Mate® Series 60 Installation Instructions

Mullion Mate® Series 30 & 40 Installation Instructions

Mullion Mate® Series 20 Installation Instructions

Cleaning & Maintenance

Field Cutting Mullion Mate

Field Cutting Mullion Mate at Spring Location

PRODUCTSMULLION MATE® PARTITION GAP CLOSURES