Sourcing plastic air bricks from China
Plastic air bricks within heading 3925 carry 6% UK duty from China, with no trade remedies or suspensions recorded on the relevant other-builders' ware lines. Confirm the commodity code and the applicable construction-product marking route before ordering. Cambridge China Bridge sources plastic air bricks.
6% duty on plastic air bricks
Read from the UK Trade Tariff on 29 September 2026, heading 3925 covers builders' ware of plastics, not elsewhere specified or included. Other builders' ware under 3925 90 80 00 is a classification candidate for plastic air bricks. The table repeats that candidate code for different product designs; these are not separate tariff subdivisions.
The supplied tariff extract records 6% duty from China throughout the heading, with no anti-dumping or countervailing measures and no suspensions. No import controls are recorded against 3925 90 80 00 or the permanent-installation fittings line 3925 90 10 00. The fluorinated greenhouse gas control appears against the doors and windows line 3925 20 00 00; if that line is proposed, confirm its requirements with your customs broker.
Give the broker drawings, material details, intended installation and details of any supplied duct fittings to confirm the commodity code. For the wider heading, see plastic building access panels. For cable management products, see our plastic cable trunking sourcing guide.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Plastic air bricks, subject to classification confirmation | 3925 90 80 00 | 6% | None |
Specify the opening, airflow and installation
Specify face dimensions, body depth, opening dimensions, polymer, colour and the connection to any sleeve or telescopic duct. State whether the air brick serves a subfloor void or another ventilation path. Ask for free-area data for the complete assembly, including mesh, rather than relying on the outside dimensions.
Agree resistance to weathering, colour change and handling damage, together with test evidence for any claimed fire performance. Approve a sample installed with the intended sleeve and wall detail. Record the resin grade and any agreed recycled content so substitutions can be checked.
CE marking remains available for construction products placed on the Great Britain market. Under the construction-product CE route, a product must be covered by a harmonised European standard or have a European Technical Assessment before it can bear CE marking. Ask which route applies to the exact air brick; do not accept a generic certificate for unrelated plastic products.
Worked duty example
Illustrative example, not a quote: Illustrative order: 20 pallets of plastic air bricks under 3925 90 80 00, invoiced at £18,000 free on board, with £1,500 of freight and insurance to the UK. The customs value is £19,500. Duty at 6% is £1,170. Import VAT at 20% is charged on the customs value plus duty, £20,670, so it is £4,134. Import taxes total £5,304; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £1,170 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Fit: measure the face, depth and duct connection against the approved drawing, and assemble samples with the intended sleeves.
Openings: check for moulding flash, blocked slots and loose mesh; compare the complete assembly with the approved free-area data.
Material and finish: compare colour and weight with the approved sample, inspect for warping and cracked corners, and check batch material records.
Packing and documents: inspect arrival cartons for crushed faces, match batch identification to delivery records and compare performance documents with the supplied model. Arrange a quality inspection before dispatch.
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What goes wrong
A matching face size can conceal a smaller ventilation opening. Mesh, moulding flash or an incompatible sleeve can restrict the intended airflow. Warped bodies may fit poorly in the wall opening, while brittle corners can crack during unloading or installation.
Orders also fail when the factory changes the resin or colour formulation after sample approval. Keep the approved sample and drawing available for batch comparison, and check that airflow and weathering evidence relates to the actual assembly being supplied.
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.
Frequently asked questions
What is the UK import duty on plastic air bricks from China?
The supplied tariff extract records 6% duty under heading 3925, including candidate code 3925 90 80 00, with no trade remedies or suspensions. Confirm the classification of your model.
Do plastic air bricks need CE marking?
Check the exact product's marking route. Construction-product CE marking requires coverage by a harmonised European standard or a European Technical Assessment; a generic plastics certificate does not establish that route.
What airflow information should I request?
Ask for free-area data for the complete air brick, mesh and sleeve assembly, plus airflow test information relevant to its intended use. Outside dimensions alone do not describe the ventilation opening.
How do I check plastic air bricks on arrival?
Compare dimensions and colour with the approved sample, trial the duct connections, inspect slots and mesh, and check for warping, cracked corners and damage inside crushed cartons.