Small Gap Under Door Seal Kit (Up To 1") - GapFix™ Door Bottom Sealing System for 36" Commercial Doors

Complete Commercial Door Bottom Seal Kit - Threshold + Brush Sweep (Inspection-Ready Options)

The GapFix™ Door Bottom Sealing System is a purpose-builtunder door seal kit for commercial openings that need more than a single part.This kit includes an ADA-compliant, fire-rated commercial threshold plus acertified brush door sweep to help seal small gaps up to 1" under36" commercial doors.

This is the right choice when you’re trying to fix a door gap fast with amatched system that installs clean and performs like a commercial assembly.

Kit Components

• 1 Each GapFix™ ADA & Fire-Rated Commercial Door Threshold
  5" x 1/2" x 36" | .109" wall | up to 1000 lb load | mill finish aluminum | Made in USA (7 Day Production Time)
• 1 Each Certified Brush Door Sweep
  1/2" gray nylon brush | 7/8" tall clear anodized aluminum holder | #6 x 3/4" stainless screws | slotted holes for adjustment

Key Specs (For Contractors)

• Gap capability: Seals under-door gaps up to 1" (when properly installed and adjusted)
• ADA threshold height: 1/2" barrier-free profile
• Sweep holder: Clear anodized aluminum | Brush: Gray nylon
• Durability: Abrasion resistant brush with strong memory and flexibility
• Important: Brush sweeps are not designed for water penetration

Compliance & Testing Summary

• Fire door / positive pressure (UL): CAN/ULC-S104, ANSI/UL10B, ANSI/UL10C - complies with NFPA 80 and NFPA 252 (per listing and applicable codes)
• Smoke & draft: UL certified to ANSI/UL1784 Category "H" for use on "S" labeled doors (per listing and applicable codes)
• Air infiltration tested: ASTM E283
• ANSI/BHMA: Certified to ANSI/BHMA A156.22 performance tests for heat and cold; listed in BHMA Certified Products Directory
• REACH and RoHS compliant

Installation PDFs

📄 Threshold Installation PDF
📄 Brush Sweep Installation PDF

GapFix™ - Fix the opening, not just the hardware.If you’re sealing a small under-door gap on a commercial opening, this kit keeps the selection simple:threshold + sweep, sized for 36" doors, built for commercial performance.

Watch Installation Videos