Zero #521FS Door Bottom, Mortised Aluminum Track with Silicone and Intumet Seal, 1.250” Clearance
This Zero #521FS specialty Door Bottom Sweep is the ideal way to restore lost fire ratings to metal or wood doors resulting from faulty door installation or alignment issues. It is comprised of an aluminum casing, two flame retardant silicone lip seals, and Intumet™ expanding material that are mortised under the door, to fill gaps up to 1.250”. Tested per UL 10C for a 90 minute rating. Custom cut to size.
PRICED BY THE FOOT
This specialized Aluminum Track with Silicone and Intumet™ Door Bottom Sweep can fill gaps up to 1.250", making it ideal for restoring 90 minute fire-ratings to metal or wood doors with large gaps. Fire ratings can be lost when installation or alignment problems cause larger clearances than the rating permits. The rating can be restored using these INTUMET™ solutions, without the costs of structural changes or door replacement. The door bottom is comprised of an aluminum casing, two flame retardant silicone lip seals, and Intumet™ expanding material.
The INTUMET™ used in this product is FS4004 which is graphite-based material formulated to expand with strong force to approximately 100 times its original volume when exposed to extreme heat. Its forceful expansion completely blocks the passage of smoke and fire. Learn more about Intumet on our website.
The aluminum casing is designed to be mortised into a 1.750” wide and .750” deep space in the bottom of hollow metal doors. The casing itself measures 1.500” x .500” with the double silicone seal extending downward 1.250” to fill large door-to-floor gaps. The INTUMET™ piece measures 1” x .375”. See product specs for all measurements.
This door bottom can be installed on wood door too just use longer screws. (You can leave a note in the customer box upon checkout and we will provide the longer screws).
Please note, images are for illustrative purposes only. They are not actual photos. Therefore, color may vary slightly and size may be enlarged to show detail. See our product specs for exact measurements.
This product has a 1 year guarantee against defects in material and workmanship.
Click here to view our full Warranty Policy.
See our other products utilizing Intumet Fire Stop intumescent material to restore lost fire rating.
-
QuickShipNo
-
ManufacturerZero International
-
MPN521FS
- About this Product
-
Door Shoe Retainer MaterialAluminum
-
Door TypeWooden Door, Metal Door
-
MountingFully Mortised
-
- Dimensions
-
Seal Height1.250" Height
-
Total Height1.750" Height
-
Additional DimensionsDoor seal is 1.750" thick
-
LengthCustom Cut to Size
-
- Installation
-
Drill HolesDrill holes are provided
-
Installation Screws#10 x 1.50" (38.1)FPHSMS Provided
-
- Special Features
-
Intumescent / FireStopYes
-
- Finishes
-
FinishClear Anodized Aluminum (US28)
-
- Compliance Details
-
Compliance DetailsFire Rated
-