Deansteel UL Certified Double Door Perimeter Bulb Seal - Fire & Positive Pressure Rated Commercial Frame Weatherstripping

Double Door Openings - Compliance First (Don’t Risk a Non-Certified Seal)

On a double door (pair) opening, perimeter gasketing is not an accessory - it is part of the opening’s life-safety and code compliance. Too many perimeter seals on the market are not certified, not tested to the standards inspectors look for, and can put the opening at risk of non-compliance.

The Deansteel UL Certified Double Door Perimeter Bulb Seal is engineered for commercial double door frames where documentation matters. It delivers a tight, durable seal on the head and both jambs of a pair opening while supporting compliance-driven projects.

Don’t get caught installing a perimeter seal that isn’t certified. If the job is spec-driven and inspector-facing, Deansteel helps you stay on the right side of code.

UL Certified Fire and Positive Pressure Performance

This product is CERTIFIED by UL for application to rated openings:

• Fire Door Certification: CERTIFIED by UL to CAN/ULC-S104 and ANSI/UL 10B; complies with NFPA 80 and NFPA 252 for application to Hollow Metal fire doors rated up to 3 hours and Wood fire doors rated up to 90 minutes.
• Positive Pressure Certification: CERTIFIED by UL to ANSI/UL 10C; complies with IBC, NFPA 80, and NFPA 252 for application to Hollow Metal fire doors rated up to 3 hours and Wood fire doors rated up to 90 minutes.

Air Infiltration Tested to ASTM E283 (Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors) to support draft-control performance expectations in commercial openings.

ANSI Certified and IBC Compliant - Built for Spec-Driven Double Door Projects

Deansteel is not built to be the cheapest seal. It is built for compliance-first buyers who need ANSI (American National Standards Institute) certified and IBC compliant gasketing for commercial work.

Important Note for Double Door Pairs

This product seals the perimeter of the frame (head and jambs). If your project also requires sealing the center meeting stile gap between doors, you typically need a compatible astragal or meeting stile gasketing in addition to perimeter seals.

Commercial-Grade Construction and Materials

• Holder Material: Aluminum Alloy 6063, T5 Temper
• Bulb Material: Thermo-Plastic Vulcanizate (TPV)
• Finish:Mill Aluminum
• Vinyl Color:Black
• Flame-Resistant and Moisture-Resistant
• Temperature Range:-40°F to 250°F
• Fasteners Included: #6 x 3/4" Stainless Steel Sheet Metal Screws
• Slotted Screw Holes for adjustment during installation

Video Installation Guide - Watch on Desktop or Mobile

Watch the full step-by-step installation video below. This video is responsive and will scale automatically for desktop, tablet, and mobile devices.

Direct Video Link: Watch the installation video on YouTube

Installation Resources and Support

• PDF Installation Guide: Deansteel Screw-On Perimeter Seal Installation Instructions (PDF)
• Step-by-Step Installation Article: How to Install a Screw-On Bulb Seal on a Hollow Metal Frame

Deansteel Double Door Perimeter Seal - Key Features

• UL certified, compliance-first perimeter seal for commercial double door frames
• Designed to seal the frame perimeter (head and jambs) on pair openings
• Heavy-duty TPV vinyl bulb locks securely into reinforced aluminum holder
• Slotted screw holes for adjustment and clean, professional installation
• Hardware included - #6 x 3/4" stainless steel sheet metal screws