Duct Seal

Engineered Products Company’s (EPCO) Duct Seal Compound is a professional-grade solution designed to seal around junction boxes, service masts, flashing, and cable entries in commercial, industrial, and residential electrical applications. This versatile duct sealant is available in convenient sizes — individual 1 lb. bricks, a 5-pack of 1 lb. bricks, or a single 5 lb. brick — giving contractors flexible options for any project. 

Each brick is individually wrapped in release paper for easy handling, storage, and repackaging on the job site. The compound is odorless, non-sticky, and asbestos-free, making it safe and easy to work with. It provides excellent adhesion to wood, glass, aluminum, and steel, and can be painted immediately after application. 

With a wide temperature tolerance (-40°F to 180°F), EPCO’s duct seal compound is ideal for indoor or outdoor use in harsh environments. UL Listed and compliant with the 2026 NEC Article 230.8, this compound ensures a reliable, long-lasting seal that keeps out dust, moisture, and air infiltration. 

BENEFITS 

  • Protects Against Dust, Moisture, and Air Infiltration – Keeps junction boxes, service masts, and cable entries sealed and secure.
  • Speeds Up Installation – Non-sticky, easy-to-apply formula reduces cleanup and labor time.
  • Versatile Use – Ideal for commercial, residential, and industrial electrical projects.
  • Long-Lasting Performance – Maintains sealing integrity in harsh indoor and outdoor environments. 

FEATURES 

  • UL Listed & NEC Compliant: Meets 2026 National Electrical Code (NEC) Article 230.8 requirements for safe electrical installations.
  • Available in Multiple Sizes: Choose from individual 1 lb. bricks, a 5-pack of 1 lb. bricks, or a 5 lb. brick for larger projects.
  • Durable & Reliable: Maintains a secure seal in temperatures from -40°F (-40°C) to 180°F (82°C).
  • Odorless & Asbestos-Free: Safe for contractors and building occupants.
  • Excellent Adhesion: Sticks to wood, glass, aluminum, and steel surfaces without additional tools or adhesives.
  • Paint-Ready: Can be painted immediately after application for a clean, finished look.
  • Individually Wrapped Bricks: Simplifies handling, storage, and reduces jobsite waste.
1 lb Duct Seal
Duct Seal: 1 Lb. Slug
Catalog Number
EPD1
UPC Number
10101
Order Unit
LB
Unit Quantity
1
Unit Package
BX
Unit Per Case
50
Total Case Quantity
50
Min. Order Quantity
1
Ship Weight
1.00lbs.
MM Req.
No
Five Slugs of Duct Seal
Duct Seal: Package of Five (5) 1 Lb. Slugs
Catalog Number
EPD5
UPC Number
10102
Order Unit
LB
Unit Quantity
5
Unit Package
BX
Unit Per Case
10
Total Case Quantity
10
Min. Order Quantity
5
Ship Weight
5.00lbs.
MM Req.
Yes
5 Lb Brick Duct Seal
Duct Seal: 5 Lb. Brick
Catalog Number
EPD5B
UPC Number
10105
Order Unit
LB
Unit Quantity
5
Unit Package
BX
Unit Per Case
10
Total Case Quantity
10
Min. Order Quantity
5
Ship Weight
5.00lbs.
MM Req.
Yes
Frequently Asked Questions

What is EPCO Duct Seal Compound used for?

EPCO’s Duct Seal Compound is used to seal around junction boxes, flashing, service masts, and cable entries, preventing air, moisture, and dust infiltration in electrical installations.

Is the duct seal compound safe to use indoors?

Yes! It is asbestos-free, odorless, and non-sticky, making it safe for use in residential, commercial, and industrial indoor environments.

Can this product withstand extreme temperatures?

Absolutely. EPCO’s Duct Seal Compound maintains its integrity in temperatures ranging from -40°F (-40°C) to 180°F (82°C), making it suitable for both hot and cold climate installations.

Is the duct seal paintable?

Yes, the compound can be painted immediately after application for a clean, professional finish that matches surrounding surfaces.

What sizes are available?

EPCO offers three options: individual 1 lb. bricks, a package containing five 1 lb. bricks, and a 5 lb. brick for larger applications.

Does this meet code compliance requirements?

Yes. EPCO Duct Seal Compound is UL Listed and meets the 2026 NEC Article 230.8 requirements, ensuring a safe and code-compliant installation.