The DDK In-Slab Duct System is designed to exhaust air from bathroom fans, range hoods and clothes dryers, using a rectangular seamed duct which is encased in the concrete floors of high rise buildings.

The DDKduct in-slab duct system meets the following specifications:

  • Made with high quality galvanized steel using a spiral wound lockseam
  • 3 Hour F and FT rating tested in accordance with ULS S115-M95 and ASTM E814-02 test requirements
  • Impact load testing in accordance with CAN 3 A23.1 M77, Falsework for Construction Purposes
  • Airflow and cut friction chars provide in accordance with SMACNA and ASHRAE guide.

The DDK in-slab duct system consists of a full range of terminations, couplers and fittings.


1540 Booth Ave.
Coquitlam, BC Canada
V3K 1B9

Local Phone 604.523.6135
Toll Free

Fax 604.523.6136

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