At a glance
- Type: Trim and finishing collar, part of the DuraTech LDC chimney system
- Diameters: 10", 12", 14", 16", 18", 20", 22" and 24"
- Listing: UL 103 Type HT (10" to 16"); UL 103 (18" to 24")
- Clearance: At least 2" to combustibles
- Made by: DuraVent
- Built to order: 18" to 24" parts are built to order and not returnable
Description
Finishes the opening where the chimney passes a ceiling or support. DuraTech LDC is the large-diameter DuraTech chimney, 10 to 24 inch, listed to UL 103 Type HT in 10 to 16 inch and UL 103 in 18 to 24 inch.
Specifications
Dimensions
| Part | Diameter | Style | Finish | Weight |
|---|---|---|---|---|
| 10DT‑FC | 10" | Finishing Collar | — | 6.0 lb |
| 10DT‑SC | 10" | Storm Collar | — | 3.7 lb |
| 10DT‑TCR | 10" | Trim Collar for Round Support Box | — | 2.8 lb |
| 12DT‑FC | 12" | Finishing Collar | — | — |
| 12DT‑SC | 12" | Storm Collar | — | 6.0 lb |
| 12DT‑TCR | 12" | Trim Collar for Round Support Box | — | 3.1 lb |
| 14DT‑FC | 14" | Finishing Collar | — | — |
| 14DT‑SC | 14" | Storm Collar | — | 5.2 lb |
| 14DT‑TCR | 14" | Trim Collar for Round Support Box | — | 2.3 lb |
| 16DT‑FC | 16" | Finishing Collar | — | — |
| 16DT‑TCR | 16" | Trim Collar for Round Support Box | — | 6.6 lb |
| 16DT‑SC | 16" | Storm Collar | — | 1.0 lb |
| 18DT‑FC | 18" | Finishing Collar | — | — |
| 18DT‑SC | 18" | Storm Collar | — | 4.3 lb |
| 20DT‑FC | 20" | Finishing Collar | — | — |
| 20DT‑SC | 20" | Storm Collar | — | 4.3 lb |
| 22DT‑FC | 22" | Finishing Collar | — | — |
| 22DT‑SC | 22" | Storm Collar | — | 4.3 lb |
| 24DT‑FC | 24" | Finishing Collar | — | — |
| 24DT‑SC | 24" | Storm Collar | — | 4.3 lb |
Documents
Details
| System | DuraTech LDC |
|---|---|
| Listing | UL 103 Type HT (10" to 16"); UL 103 (18" to 24") |
| Clearance to combustibles | At least 2" to combustibles |
| Price basis | DuraVent 2026 list price (MSRP), effective July 1, 2026 |
| Returns | 18" to 24" parts are built to order and not returnable |
Questions
What size do I need?
The appliance's own instructions set the chimney diameter; match it, and keep the whole chimney one diameter.
What clearance does it need?
At least 2" to combustibles, per DuraVent's listing. Never fill the clearance space with insulation.
Can I mix DuraTech with other brands?
No. DuraVent's instructions require authorized DuraTech parts only, to keep the chimney listed.
Where are the installation rules?
In the documents above: supports, firestops, enclosures and chimney height are set by DuraVent's instructions, and the installer follows them.
Why is there no photo?
DuraVent images are being added; the part numbers and sizes on this page are from DuraVent's 2026 list.
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