At a glance
- Type: Chase top flashing, part of the DuraTech chimney system
- Diameters: 5", 6", 7" and 8"
- Listing: c-UL-us listed to UL 103 HT
- Clearance: 2" to combustibles
- Made by: DuraVent
Description
Seals the top of a framed chase around the chimney. DuraTech 5 to 8 inch is DuraVent's double-wall, insulated all-fuel chimney, c-UL-us listed to UL 103 HT with a 2-inch clearance to combustibles.
Specifications
Dimensions
| Part | Diameter | Style | Finish | Weight |
|---|---|---|---|---|
| 5DT‑CTF | 5" | Chase Top Flashing | — | 2.2 lb |
| 6DT‑CTF | 6" | Chase Top Flashing | — | 2.2 lb |
| 7DT‑CTF | 7" | Chase Top Flashing | — | 2.3 lb |
| 8DT‑CTF | 8" | Chase Top Flashing | — | 2.3 lb |
Documents
Details
| System | DuraTech |
|---|---|
| Listing | c-UL-us listed to UL 103 HT |
| Clearance to combustibles | 2" to combustibles |
| Price basis | DuraVent 2026 list price (MSRP), effective July 1, 2026 |
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?
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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