Air Louvers 1900A Fire-Rated Adjustable Z-Blade Fusible Link Louver

Usually Ships: 2-3 Business Days
  • 18-Gauge Steel Frame
  • For use with 1-3/4″ Thick Steel Fire Doors
  • UL Listed up to 90 Minutes (Fire-Rated)

Available Options:


1900A Fusible link louver for 1-3/4″ thick fire doors, 45-90 minute fire-rated

Adjustable Fusible Link Louvers are recommended for use in rooms where ventilation is needed and at the same time isolating the room whenever fire is present. When exposed to heat at 165° F, the fusible link trips and the spring-loaded louver blades shut, to form an airtight fire and smoke seal.

1900A Frame: Mitered and welded corners: screws fastened through prepared frame into louver core leaving corridor side of frame free of fasteners.

  • Mitered and Welded Corners
  • Free Flow Area: 45% free
  • Fusible link design temperature 165°F max
  • Single side mounting for non-corridor exposure with fastening screws included
  • Designed for use with 1-3/4″ doors only
  • UL Listed for use in 45-90 minute fire-rated doors (not allowed in 20 min. or 3-hour doors)
  • Order size is equal to door cutout size



Operation: Adjustable blades of 16 gauge CRS pivot on cadmium-plated steel rivets. The blades are operated by a manual adjusting lever. A spring loaded fusible link mechanism is incorporated into the design; upon melting of the link, the action bar is actuated, thereby closing and locking all of the blades.

Z-blade louver is riveted to the operating bar and frame at 1″ intervals to welded 1-9/16″ deep frame. Mechanical Stop holds blades open.

Fire door testing: CAN/ULC S104, NFPA252, UBC 7-2-94, UL10(b), UL10(c).   Installed in accordance with NFPA-80. Louver size shall not exceed maximum width and height shall not be less than 10″ and 6″, respectively. Louvers may be provided for classified hollow metal type and composite type fire doors. Consult with the Local Authority Having Jurisdiction (AHJ) to determine appropriate standards. Louver frame will be labeled with Listing mark.



Gray (G), Mineral Bronze (B)


12" x 12", 18" x 12", 18" x 18", 24" x 12", 24" x 18", 24" x 24"

Door Thickness



Cold Rolled Steel

Fire Rating

45 to 90 Minute – CAN/ULC S104, NFPA252, UBC 7-2-94, UL10(b), UL10(c)

Free Flow Area

45% Free Area


Phillips head screws #8 x 3/4" – Included

Buy American Act Compliance

Meets Buy Amercian Act – Made in USA


5 Year

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Air Louvers 1900A Fire-Rated Adjustable Z-Blade Fusible Link Louver