Why this ducting earns its place
Extraction systems need to scale smoothly as individual hoods merge into a central exhaust stack. When you're connecting smaller branch ducts to a larger main riser, a proper expander prevents bottlenecks and turbulence. This Combisteel converter handles the 250–350 mm step-up, ensuring the airflow accelerates into the larger duct without creating dead zones or pressure reversals that would choke the whole system.
At 2 kg, it's a substantial but still manageable component, built in stainless steel to withstand years of heat, steam, and grease in a commercial kitchen. The geometry is designed to guide expanding airflow smoothly, so you don't lose the suction that drives your individual hoods. In a busy kitchen, that's the difference between a hood that clears smoke instantly and one that lags when all burners are running.
Sizing ductwork correctly is often the hidden detail that separates a kitchen that breathes from one that feels stuffy and slow. This converter is part of that calculation—it's the component that lets multiple smaller extraction runs pool into a larger main without creating a bottleneck.
