Sourcing zinc ventilation cowls from China

Duty and classification for zinc cowls

Read from the UK Trade Tariff on 4 October 2026, heading 7907 covers other articles of zinc. Zinc ventilation cowls classified here fall under 7907 00 00 90, carrying 0% duty from China. The supplied record shows no anti-dumping or countervailing duty and no suspension. The table describes different cowl configurations under the same tariff line.

The UK Trade Tariff attaches import and export waste controls to this line. If a China shipment is waste subject to notification controls, the exporter must apply to the dispatch country's competent authority for consent. Ask your customs broker to confirm the applicable waste requirements, including those for any return shipment; do not treat the finished-product code as waste-shipment approval.

Confirm composition, function and the complete assembly using finding your commodity code. Galvanised steel is steel, even when described by a supplier as zinc-coated. For the wider heading, see formed zinc chimney flashings.

Collar fit, rain protection and intended use

Specify zinc material, sheet thickness, collar profile, insertion depth, fixing positions and roof-base geometry on an approved drawing. Agree whether the collar fits inside or outside the duct. Record hood clearance, mesh opening, ventilation free area and the proposed method for checking airflow and wind-driven rain entry.

Describe the application as ventilation and identify the duct and roof arrangement. Do not accept a supplier's claim that the same cowl suits a combustion flue without separate application evidence. Ask whether a designated construction-product standard covers the model and request the applicable performance declaration, marking evidence and installation instructions.

Legitimately CE-marked construction products can continue to be supplied in Great Britain. Match the supporting documents to the actual cowl model and intended use before accepting the marking. Agree joint construction, compatible fixings, surface finish and protective packing alongside the drawing.

Worked duty example

Illustrative example, not a quote: Illustrative order: 2 tonnes of zinc ventilation cowls under 7907 00 00 90, invoiced at £9,000 free on board, with £900 of freight and insurance to the UK. The customs value is £9,900. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £9,900, so it is £1,980. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Material: check the material report against the ordered zinc specification and measure sheet thickness on accessible edges.

Fit: measure the collar and fixing positions, then trial-fit a sample to the agreed mating duct and roof base.

Weather and airflow: check hood clearance, drainage paths and mesh attachment; run the agreed rain-entry and airflow checks on the assembled sample.

Joints and packing: inspect seams, soldered joints where specified, sharp edges and loose fixings; check for crushed hoods, trapped moisture and carton abrasion.

What goes wrong

A collar can match the nominal duct size yet fail to fit because the factory interprets the mating dimensions differently. Mesh or a low hood can restrict the opening, while distorted seams and an unsuitable drainage path let rain reach the duct. Approve an assembled sample against the installation drawing.

Nested cowls can arrive with flattened hoods, rubbed finishes or bent mounting bases. Agree separators and support points, photograph unpacked samples and record defects before installation. A report for a different terminal or material does not establish the ordered model's performance.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.