Whether your duct run goes straight up through the roof or turns through several walls affects both cost and performance. Here's how to plan it.
Vertical Runs (Straight Through the Roof)
- Shortest, most efficient path — least resistance, smallest fan needed for a given airflow
- Requires roof penetration and weatherproofing (we supply matching weather cowls for this)
- Usually the cheaper option in ducting and fittings, but not always possible depending on the building
Horizontal Runs (Through Walls)
- Necessary when roof access isn't available or the extraction point is far from an external wall
- Every 90° bend adds resistance — minimising the number of elbows in a run keeps fan performance efficient
- Longer horizontal runs may need a larger diameter duct or a more powerful fan to compensate for resistance
General Rule
Keep the duct run as short and as straight as possible. Every bend and every extra metre of ducting is resistance the fan has to work against — which affects both extraction performance and running cost. We supply spiral pipe, 90° bends, and spigots to DW144 standard, so a route can be built to fit the building rather than forcing the building to fit a standard layout.
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Canopy Man manufactures commercial kitchen extraction in Birmingham and delivers across England & Wales. Call 07458 148000 / 07300 815599 or contact us for advice or a quote.