Home > Door Seals > INTUMET™/Fire Stop > Zero #521FS Door Bottom, Mortised Aluminum Track with Silicone and Intumet Seal, 1.250” Clearance

Zero #521FS Door Bottom, Mortised Aluminum Track with Silicone and Intumet Seal, 1.250” Clearance

Zero #521FS Door Bottom, Mortised Aluminum Track with Silicone and Intumet Seal, 1.250” Clearance
Product Spec of Mortised Door Bottom 521

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

Price: $22.07
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SKU Z521FS-AA
Shipping See Shipping Tab Below
Description

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 wesite.

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 custome box upon checkout and we will provide the longer screws).

Fire Rated, Smoke Rated

  • Restore 90 min fire rating to metal doors
  • Aluminum, Silicone, and INTUMET™ Door Bottom Sweep
  • Excessive 1.250” clearance
  • Mortised within 1.750” x .75” space
  • Custom cut to size

Installation screws provided.

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.

Product Specs
Compliance Details

compliance details for z521fs

Shipping / Returns
  • Ship Time:
    • This product is custom made to your specifications, please allow 2-3 weeks to ship
    • *Similar or equivalent products from other manufacturers may be available to ship sooner. For expedited processing please contact our customer service department.
    • EXCEPTIONS: Gold Anodized Aluminum and Black Anodized Aluminum Products require 2-6 week processing time.
    • Ships via major carriers, such as UPS or FedEx Ground, with tracking information provided.
       
  • Domestic Shipping Fees- (Hawaii and Alaska not Included):
    • FREE SHIPPING on orders over $200.00 (excludes oversized and freight orders).
    • There will be a flat $19.99 shipping and handling fee on orders under $200.00.
    • Oversized Items: Items 86" and above have an oversize surcharge of $70.00
    • Freight Orders: Items 95" and above require freight shipment and have a shipping charge of $150.00
    • Orders totals above $1,500.00 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 commited to your satisfaction, as a courtesy, we may, at our discretion accept returns with a minimum 30% restock fee.
    • Weatherstripping products will not be considered for returns.
    • Item must be in new, resaleable 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.
Reviews
Product reviews are only available to verified buyers of this product. To leave a review, please refer to the product review email we sent you.
pros
  • Durable (2)
  • Easy To Use (2)
  • Good Design (2)
  • Quality Materials (2)
cons
best uses
  • Outside (1)

Reviewed by 2 customers

Displaying reviews 1-2

By Joe D.

from Raleigh, NC

About Me Professional

Verified buyer
5.0
Great Product!
01/18/18
pros
  • Durable
  • Easy To Use
  • Good Design
  • Quality Materials
cons
best uses
Comments about Zero #521FS Door Bottom, Mortised Aluminum Track with Silicone and Intumet Seal, 1.250” Clearance:
Easy to cut and use as mortised into the bottom of a hollow metal door. Worked perfect!
Bottom Line Yes, I would recommend this to a friend

By Anonymous

from Tampa, Florida

About Me Avid Do-It-Yourselfer

Verified buyer
5.0
Door Sweep
08/27/14
pros
  • Durable
  • Easy To Use
  • Good Design
  • Quality Materials
cons
best uses
  • Outside
Comments about Zero #521FS Door Bottom, Mortised Aluminum Track with Silicone and Intumet Seal, 1.250” Clearance:
Used the product outside on our double doors and it worked perfectly.
Bottom Line Yes, I would recommend this to a friend
Displaying reviews 1-2
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