At a glance
- Type: Firestop and radiation shield, 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
Keeps the required clearance where the chimney passes through a floor, ceiling or roof. 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‑FRSHT | 10" | Firestop Radiation Shield | — | 1.0 lb |
| 10DT‑RRSHT | 10" | Roof Radiation Shield | — | 1.0 lb |
| 12DT‑FRSHT | 12" | Firestop Radiation Shield | — | 15.7 lb |
| 12DT‑RRSHT | 12" | Roof Radiation Shield | — | 2.0 lb |
| 14DT‑FRSHT | 14" | Firestop Radiation Shield | — | 17.3 lb |
| 14DT‑RRSHT | 14" | Roof Radiation Shield | — | 2.0 lb |
| 16DT‑FRSHT | 16" | Firestop Radiation Shield | — | 2.0 lb |
| 16DT‑RRSHT | 16" | Roof Radiation Shield | — | 20.0 lb |
| 18DT‑FRS | 18" | Firestop Radiation Shield | — | 22.0 lb |
| 18DT‑RRS | 18" | Roof Radiation Shield (18"-24") | — | 7.4 lb |
| 20DT‑FRS | 20" | Firestop Radiation Shield | — | 3.0 lb |
| 22DT‑FRS | 22" | Firestop Radiation Shield | — | 34.0 lb |
| 24DT‑FRS | 24" | Firestop Radiation Shield | — | — |
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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