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

See tabs below for additional information
    • SKU
      ZR521FS-AA
    • Market price:$27.35
      • save 5%
    • Starting price: Price: $25.98 per 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.

      • SKU
        ZR521FS-AA
    • QuickShip
      No
    • Manufacturer
      Zero International
    • MPN
      521FS
    • About this Product
      • Door Shoe Retainer Material
        Aluminum
      • Door Type
        Wooden Door, Metal Door
      • Mounting
        Fully Mortised
    • Dimensions
      • Seal Height
        1.250" Height
      • Total Height
        1.750" Height
      • Additional Dimensions
        Door seal is 1.750" thick
      • Length
        Custom Cut to Size
    • Installation
      • Drill Holes
        Drill holes are provided
      • Installation Screws
        #10 x 1.50" (38.1)FPHSMS Provided
    • Special Features
      • Intumescent / FireStop
        Yes
    • Finishes
      • Finish
        Clear Anodized Aluminum (US28)
    • Compliance Details
      • Compliance Details
        Fire Rated

    compliance details for z521fs


    SHIPPING / PROCESSING TIME:


    This product ships directly from the manufacturer. 
    Please allow 1 - 4 weeks to ship


    • Domestic Shipping Fees- (Hawaii and Alaska not Included):
      • FREE SHIPPING on orders over $300.00 (excludes oversized and freight orders). 
      • There will be a flat $19.99 shipping and handling fee on orders under $300.00.
      • Freight Items: Orders containing items sized 90" - 96" have an oversize surcharge of $199.00.
      • Oversize Freight Items: Orders containing items sized 97" and above have an oversize surcharge of $250.00.
      • Orders totals above $2,000.00 will ship free, regardless of size.
         
    • Alaska and Hawaii, Canada, and International Shipping:
    • Returns:
      • This product is custom made and is not returnable.
      • We are committed to your satisfaction, as a courtesy, we may, at our discretion accept returns with a minimum 30% restock fee.
      • CLAIMS FOR SHORTAGE OR DAMAGE IN TRANSIT: All claims must be made within ten (10) days of receipt of goods.
      • Weatherstripping products will not be considered for returns.
      • Item must be in new, re-saleable condition.
      • Please call or email us to receive an RMA number before returning. No returns will be processed without an RMA number.
      • Return shipping is customer's responsibility. A return address will be provided with RMA#.
      • If you are shipping via USPS (not recommended) do NOT require signature as we will not be able to pick up your package from local post office facility.