Airtight Transfer Duct 150 - Airtight Rangehood Ceiling Collar

A galvanised steel collar that turns a rangehood duct penetration into a sealed part of your ceiling airtightness layer. The 250 mm square flange fixes and seals to the plasterboard or membrane, and the Ø148 mm spigot slips straight inside standard 150 mm rigid or flexible duct — no tape-only joins, no gaps around the duct where warm air and moisture leak into the roof space. Rangehood penetrations are one of the largest single leaks in an Australian ceiling. CollarTight gives you a rigid, durable connection that can be sealed once and stays sealed, whether you're chasing a blower door target or just stopping draughts and condensation. Features Ø148 mm spigot fits inside 150 mm duct for a snug, easy connection 250 mm square flange for fixing and sealing to plasterboard, membrane or rigid air barrier 0.8 mm galvanised sheet, spot-welded spigot-to-flange junction 200 mm spigot each side of the flange Suits rangehood, exhaust fan and supply/extract ventilation ducts Seal flange perimeter with airtightness tape or sealant on both faces Specifications Duct size: 150 mm nominal Spigot: Ø148 mm OD Flange: 250 × 250 mm Overall height: 400 mm Material: 0.8 mm galvanised steel Installation Cut a 150 mm hole in the ceiling lining, insert the collar, fix the flange, then seal the perimeter with airtightness tape or sealant. Connect duct to the spigot and secure with a duct clamp and tape. Made for Australian ceilings by Tight House.