90 Degree T-Piece

90 degree T-pieces for galvanised spiral ducting, available in 19 diameters from 80mm to 630mm and stocked up to 250mm. The right-angle tee is the most compact way to take a branch off a duct run — the go-to fitting for general supply and extract ventilation where space is tighter than the pressure budget.

Using a 90 degree tee

Fit a 90 degree T-piece wherever a branch must leave the main run squarely: feeding a grille box below a ceiling run, teeing off to a second room, or forming the junction at the top of a riser. The three openings share the same diameter, so a branch of a smaller size simply takes a reducer on the branch leg. Where airflow performance matters more than space — long extract lines, dust extraction — consider the 45 degree T-piece or Y-piece instead.

Available sizes: 80, 100, 125, 150, 160, 180, 200, 224, 250, 280, 300, 315, 355, 400, 450, 500, 560, 600 and 630mm. Sizes up to and including 250mm are held in stock; larger sizes are made to order. Stocked sizes ordered by 3pm are despatched for next-day delivery, with free UK mainland delivery over £400 ex VAT.