Louvers are components that provide ventilation when installed in hollow metal or architectural wood doors. There are two main types of louvers: AFDL (Fixed Blade Door Louver) and FLDL (Fusible Link Door Louver).
Lovuer Types
AFDL Louvers
![](https://learn.reeb.com/wp-content/uploads/2020/03/afdllouver.jpg)
AFDL louvers are fixed in position to allow for ventilation but do not possess any additional fire-resistant properties. In other words, they cannot withstand fire scenarios.
![](https://learn.reeb.com/wp-content/uploads/2020/03/afdllouverillustration.jpg)
FLDL Louvers
![](https://learn.reeb.com/wp-content/uploads/2020/03/fldllouver.jpg)
FLDL louvers are designed with slats that allow for ventilation. When exposed to elevated temperatures during a fire, these slats gradually become vertical and interlock, preventing the fire from spreading through the louver.
![](https://learn.reeb.com/wp-content/uploads/2020/03/fldllouverillustration.jpg)
It’s important to note that when FLDL louvers are installed in Light Commercial RF Series doors, which have a thinner steel skin compared to Hollow Metal doors, the door’s fire rating is limited to 45 minutes rather than the usual 90 minutes. Additionally, louvers cannot be used in 20-minute doors.
Standard Layout Options
![](https://learn.reeb.com/wp-content/uploads/2020/03/1818liteplacement.jpg)
18″ x 18″ Louver
A-13″, B-Equal
![](https://learn.reeb.com/wp-content/uploads/2020/03/2412litepclaement.jpg)
24″ x 12″ Louver
A-13″, B-Equal
![](https://learn.reeb.com/wp-content/uploads/2020/03/2424liteplacement.jpg)
24″ x 24″ Louver
A-13″, B-Equal
Size | AFDL Non-Rated | FLDL Up to 90 min. Rating |
---|---|---|
18″ x 18″ | X | — |
24″ x 12″ | X | — |
24″ x 24″ | X | X |
Please note that other size options and styles may be available for special order.
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