Commercial Door Louvers

Louvers provide a ventilation when inserted into a hollow metal or architectural wood door. There are two types: the non-rated AFDL or Fixed Blade Door Louver, and the rated FLDL or Fusible Link Door Louver.



A Light Commercial RF Series door cannot have a 90 minute rating with the FLDL louvers installed. These doors have a thinner steel skin than Hollow Metal doors giving less integrity to the cut area around the louver. Therefore, a RF door with a FLDL louver in a 90-minute frame can only be rated to 45 minutes. No matter what, louvers cannot be used in a 20 minute door!

Louver Types

AFDL louvers are fixed louvers to allow for ventilation but do not have any additional function, meaning they cannot withstand any fire scenario.

FLDL louvers are louvers with slats to allow for ventilation. When temperatures increase due to a fire, the slats slowly become vertical and interlock in place preventing the fire from spreading.

Click here for additional information on AFDL and FLDL Louvers.

FLDL Field Installation Instructions

FLDL Reinstallation and Removal Instructions

Standard Layout Options

Louver Placement

18″ x 18″ Louver
A-18″, B-18″
C-13″, D-Equal

24″ x 12″ Louver
A-24″, B-12″
C-13″, D-Equal

24″ x 24″ Louver
A-24″, B-24″
C-13″, D-Equal

Size AFDL Non-Rated FLDL Up to 90 min. Rating
18″ x 18″ X
24″ x 12″ X
24″ x 24″ X X

Other options and styles may be available for special order. Please contact Reeb’s Commercial Quoting or Customer Service Department for more information.

Updated on June 11, 2022

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