In-Slab Ventilation Duct Systems – Innovative High-Rise HVAC

Galvanized sheet-metal ducts cast directly into concrete slabs—taller ceilings, energy efficiency, faster construction, noise reduction. Manufactured in-house in Mission, BC.

10 Key Benefits

10 Ways DDK™ Redefines Building Excellence

  • Superior Aesthetics & Taller Ceilings — Clean, flat ceilings with more usable headroom for open, modern designs.
  • Energy Efficiency via Thermal Mass — Concrete slab acts as a natural thermal battery, reducing HVAC runtime and long-term energy costs.
  • Accelerated High-Rise Construction — Pre-fab sections hoisted and tied to rebar before pour—streamlines MEP coordination and shortens timelines.
  • Unmatched Noise Reduction — Dense concrete encasement minimizes sound transmission between floors for quieter spaces.
  • Optimal Airflow & Efficiency — Smooth galvanized interiors reduce turbulence, friction, and energy use.
  • Space Optimization — No ceiling/wall runs—enables flexible layouts and increased rentable/sellable area.
  • Cleaner, Healthier Operation — Sheet metal resists dust and microbial growth better than fiberglass alternatives.
  • Durability & Longevity — G-60 galvanized steel withstands corrosion and structural stress for decades.
  • Certified Compliance & Peace of Mind — QAI Listed (B1135-1 Edition 2) for fire-stopping penetrations (CAN/ULC S115 & ASTM E814), fully meets National Building Code and BC requirements.
  • Local Canadian Manufacturing — Produced in Mission, BC—fast local stock, same-day shipping across Fraser Valley/Greater Vancouver/Western Canada, climate/code compatible.

Certified for Performance & Fire Safety

The DDK™ In-Slab Ventilation System is QAI Listed under Listing No. B1135-1 for Fire-Stopping Penetration Systems, tested to CAN/ULC S115 and ASTM E814 standards.

Each component — from the fire-stopped inlet boots to the galvanized ducts — meets or exceeds National Building Code requirements, giving builders full confidence and quick approval on inspections.

Proudly Made in Canada

Manufactured in Mission, BC, using G-60 galvanized steel, the DDK™ In-Slab system is built for strength, durability, and corrosion resistance. All products are stocked locally and available for fast shipping throughout the Fraser Valley, Greater Vancouver, and Western Canada.

Ready to Elevate Your Next High-Rise or Multi-Unit Project?

Contact us for technical resources, samples, or to discuss how In-Slab Duct can optimize your design, schedule, and occupant experience.

Get Free Samples or Quote Schedule a Lunch & Learn for Your Team