DuraVent DuraTech 6DT-CS24IS 24″ Square Ceiling Support Box w/ Collar


Brand: Duravent


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DuraVent DuraTech 6DT-CS24IS 24″ Square Ceiling Support Box w/ Collar

DuraTech 6DT-CS24IS 24″ Square Ceiling Support Box w/ Collar. Use with flat, vaulted or cathedral ceilings where there is an attic space above. Supports up to 40’ of DuraTech Chimney. The additional Insulation Collar now enables the support box to be qualified as an Attic Insulation Shield. The additional Attic Insulation Shield (DT-AIS) is not required with these support boxes. (For adapters see DVL/DuraBlack section.)

Duratech is designed for appliances that are tested and listed for use with a 2100°F HT chimney system, such as wood stoves, fireplaces, furnaces, boilers, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas. Available in all stainless steel (5″-8″ SS) or with a galvalume (6″-8″ GA) outer casing and stainless steel inner wall with twist-lock connections.

DuraTech 24”, 36”, 48”, and 60” chimney pipe available with additional protective carton filler (CF) for shipping.

To calculate installed length of 5”, 6”, 7”, or 8” DuraTech Chimney, subtract 1 1⁄4” from each joint overlap of chimney pipe. Allow a minimum of 2” air space to combustibles when installing DuraTech Chimney

DuraTech: The optimum in safety and performance for an all-fuel chimney.


  • Limited Lifetime Warranty
  • Wide variety of diameters available.
  • Twist-lock fittings. No locking bands or mechanical fasteners required
  • Available with stainless or galvalume outer walls.
  • 1” Refractory insulation encased between two walls keeps the outer wall cool, while ensuring high flue gas temperatures for optimum draft performance
  • Light weight Thermo Tech insulation makes pipe sections lighter
  • Has the smallest outside diameter available to allow easy placement between studs
  • Thickest inner wall construction in the industry providing the best protection from creosote fires.
  • 430 Stainless Steel Inner Wall
  • UL Listed

Also available:

6DT-CS36 Square Ceiling Support Box – 36″

6DT-CS24 Square Ceiling Support Box – 24″

6DT-CS11 Square Ceiling Support Box – 11″

6DT-21TASS Adjustable Pipe 14″-21″

6DT-60SSCF 60″ Chimney Pipe – SS (CF)

5DT-TCR Trim Collar for Round Support Box – 5″ – 6″ (round)

5DT-TC Trim Collar for Round Support Box – 5″ – 6″ (square)

6DT-RCS Round Ceiling Support Box

6DT-FF Flat Roof Flashing

5DT-SC Storm Collar 5″ – 6″

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Weight21 lbs


Duratech Install manual




M&G DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products with the exception of Ventinox® (lifetime), and PolyPro® (ten years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from defects in material or manufacturing, if properly installed, maintained and used. DuraVent products are fully warranted if installed only by a professional installer. See owners manual for full warranty.


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