4" x 4" Smoke Pipe Tee, 26GA

Lukjan Duct Tee, 90° — Series 6, 4″, Crimped Connection, 9-1/4″ L × 4″ W

A 90-degree crimped duct tee from Lukjan’s Series 6 line, designed to branch airflow from a main 4-inch duct into a perpendicular 4-inch branch. The crimped connection facilitates easy insertion into mating ductwork.

• Series / model: Series 6 (Lukjan duct / fitting line) :contentReference[oaicite:1]{index=1}
• Part / model number: RX7004 (4″ × 4″ smoke pipe tee, 26 ga) :contentReference[oaicite:2]{index=2}
• Configuration: 90° duct tee, branching at right angle
• Main diameter: 4 inch (for both run and branch) :contentReference[oaicite:3]{index=3}
• Connection style: Crimped ends (for insertion into duct sockets) :contentReference[oaicite:4]{index=4}
• Length (main run): 9-1/4 inches (9.25″) :contentReference[oaicite:5]{index=5}
• Width / branch size: 4 inches (same as main duct) :contentReference[oaicite:6]{index=6}
• Material: Galvanized steel (standard for HVAC sheet metal fittings) :contentReference[oaicite:7]{index=7}
• Finish: Galvanized coating / zinc finish for corrosion resistance (typical for Lukjan ductwork) :contentReference[oaicite:8]{index=8}
• Gauge / thickness: 26 gauge (for the 4″ smoke pipe tee listing) :contentReference[oaicite:9]{index=9}
• Weight: 0.70 lb (as per the product listing) :contentReference[oaicite:10]{index=10}
• Mounting / installation:
  • Insert the crimped ends into the mating duct/tee sockets and secure with sheet-metal screws, rivets, or straps
  • Seal all seams and joints with foil duct tape or mastic to prevent leakage
  • Ensure proper alignment of run and branch ducts to minimize turbulence and stress on joints
• Applications:
  • Used in HVAC systems (particularly smoke pipe / furnace ductwork) to split airflow between two 4-inch ducts
  • Typical in residential or light commercial installations where a side branch is needed off a 4″ main run
• Performance & design notes:
  • Because this is a sharp 90° branch, expect some pressure drop / flow loss relative to straight duct; system design should account for this
  • The crimped connection allows easier field fit, but care must be taken to ensure a tight, secure joint
  • Galvanized steel construction provides durability and compatibility with standard duct systems