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.

Limited-Time Offer: 15% Off Locally Stocked In-Slab Duct Systems

Keep your projects on schedule and under budget with our premium, Canadian-made in-slab ventilation duct products. Cast directly into concrete slabs, our systems eliminate dropped ceilings and bulky bulkheads—maximizing both construction speed and building value.

For a limited time, take 15% off all immediately available, in-stock items.

Product NameUnitOriginal PricePromotional Price
Slab DuctSQFT$5.175$4.50
Soffit GrillPieces$6.325$5.50
ChairPieces$0.69$0.60
6″ Inlet BootPieces$21.85$19.00
Soffit DischargePieces$9.20$8.00
End WallPieces$9.20$8.00
CouplersPieces$7.475$6.50
45 Degree ElbowsPieces$8.625$7.50

  • QAI Certified Safety: All products are QAI Listed and tested to ensure strict jobsite compliance.
  • Firestopping Rated: Evaluated for Penetration Firestopping with up to a 180-minute rating.
  • Heavy-Duty Build: Reinforced galvanized sheet metal with spiral-wound lockseams.
  • Engineering Support: We can assist with fan sizing and static pressure calculations.
Secure Your Order & Save 15%

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.

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