By DuraVent

    DuraTech LDC Chase Top Flashing

    $348.95
    $348.95
    Diameter: 18 inch
    Availability:
    SKU: 18DT-CTF
    $348.95
    $348.95

    At a glance

    • Type: Chase top flashing, 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

    Seals the top of a framed chase around the chimney. 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‑CTF 10" Chase Top Flashing — 7.0 lb
    12DT‑CTF 12" Chase Top Flashing — 11.6 lb
    14DT‑CTF 14" Chase Top Flashing — 8.0 lb
    16DT‑CTF 16" Chase Top Flashing — 10.9 lb
    18DT‑CTF 18" Chase Top Flashing — 18.0 lb
    20DT‑CTF 20" Chase Top Flashing — 14.0 lb
    22DT‑CTF 22" Chase Top Flashing — —
    24DT‑CTF 24" Chase Top Flashing — —

    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.

    If you have any questions about this product, please let us know by filling out the form below, and we will contact you as soon as possible.