8" Smoke Chimney Cap

Lukjan Non-Adjustable Rain Cap — Series 47, Ø 8″, 9-1/2″ Length × 12-1/2″ Width

Fixed (non-adjustable) rain / vent cap intended for 8-inch round duct or flue terminations. The Series 47 rain cap provides weather protection without moving parts, with a generous hood and skirt to shield the duct opening from precipitation, debris, and pests.

• Series / model: Series 47 non-adjustable rain / chimney cap (Lukjan) :contentReference[oaicite:1]{index=1}
• Nominal duct connection: 8 inches diameter (round duct / flue) :contentReference[oaicite:2]{index=2}
• Overall depth / projection (front-to-back): 9-1/2 inches (9.50″) :contentReference[oaicite:3]{index=3}
• Overall brim / hood width: 12-1/2 inches (12.50″) :contentReference[oaicite:4]{index=4}
• Material: Galvanized steel (standard for Lukjan sheet metal vent caps)
• Finish: Galvanized coating (zinc) to resist rust and outdoor exposure
• Weight: ~0.50 lb (typical for the corresponding 8″ cap model) :contentReference[oaicite:5]{index=5}
• Design features:
  • Non-adjustable (fixed hood) — no sliding or movable parts.
  • Wide hood / brim helps deflect rain and snow away from the duct inlet.
  • Vertical skirt or side walls to minimize wind-driven water entry.
  • Edge hems or flanges (where present) stiffen the hood edges and reduce sharpness (common in metal vent caps).
• Installation / mounting:
  • Slip or bolt the cap over the duct / chimney pipe end, ensuring full seating over the termination.
  • Secure with corrosion-resistant sheet-metal screws or fasteners via skirt flanges or optional brackets.
  • Seal at the base between the duct and the cap (using high-quality exterior sealant or flashing) to prevent water infiltration.
  • Mount level, stable, and plumb — avoid tilt or misalignment that could compromise performance or cause stress under wind load.
• Performance & design considerations:
  • The 12-1/2″ brim width relative to the 8″ duct gives a generous overhang, helping to minimize rain entry even under angled wind conditions.
  • The 9.5″ depth ensures vertical spacing so water drips past the duct opening rather than splashes inward.
  • Because it is fixed, no mechanisms reduce maintenance complexity or points of failure.
  • In more corrosive or coastal environments, optional stainless steel or painted finishes might be preferable for longevity.
• Limitations & notes:
  • As a non-adjustable cap, it may not adapt well if duct termination heights vary — precise installation is important.
  • Debris, leaves, or bird nests may accumulate under the brim — periodic inspection and cleaning are recommended.
  • Sufficient clearance to surrounding structure should be maintained so that the hood does not impinge on walls, soffits, or overhangs.