Where and how a duct run terminates outside the building matters as much as the routing inside it. Getting this wrong causes weather ingress, poor extraction, and neighbour complaints.
Roof Termination
The most common termination point. Needs a weatherproof cowl to stop rain and debris entering while still allowing exhaust air to escape freely — we supply weather cowls sized to match every duct diameter we stock.
Wall Termination
Used when roof access isn't available. Requires careful positioning away from windows, doors, and neighbouring properties to avoid odour or noise complaints — and often needs a bird-beak or louvre cowl rather than a simple cap.
Clearance Requirements
Termination points should be positioned away from openable windows, air intakes, and boundary lines. For kitchens producing heavy grease-laden air, additional clearance from the ground and neighbouring structures may be required.
Fire and Safety Considerations
Termination points near flues, gas meters, or other services need adequate clearance — this is checked during commercial kitchen compliance inspections alongside DW144 ductwork standards.
We supply weather cowls, bird-beak cowls, and China hat vent caps to fit every standard diameter — tell us your termination point (roof or wall) and we'll recommend the right fitting.
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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.