Ducting
Rigid and flexible ducting, external cowls, and insulation wrap for cooker hood extraction. Why 150mm rigid duct is the standard, and how the wrong substitution silently kills extractor performance.
Duct Cowls: External Vent Types, Anti-Rattle Advice, and What to Buy
UK guide to kitchen extractor duct cowls. Louvred, gravity flap, inline non-return valve, and render-finish options. Sizes 100mm, 125mm, 150mm. Prices from £4 to £110.
Duct Insulation Wrap: Why Loft Ducts Drip and How to Stop It
The UK guide to insulating kitchen extract ducts in lofts and cold voids. Approved Document F specification, product types, and how to fit it so the ceiling doesn't stain.
Flexible Ducting: Why It Fails and When It's Actually Acceptable
The UK guide to flexible extraction ducting. Why corrugated bore halves airflow, the 1.5m Building Regs limit, Part F commissioning risk, and which type to buy for cooker hoods.
150mm Rigid Ducting: The Correct Spec for Cooker Hood Extraction
UK guide to 150mm rigid cooker hood ducting. Why 150mm not 125mm, the 220x90mm flat-channel equivalent, Part F airflow rates, fittings, and where to source the full range.