Plastic Circular Ducting Reducer – 125mm – 100mm

Alpha Air Ventilation Supplies

£2.32

Rigid PVC reducer for joining two different sizes of plastic ventilation ducting in a neat, airtight transition. Push-fit connection. 125mm to 100mm reducer for round plastic ducting a rigid white PVC fitting that steps a 125mm ventilation duct down to 100mm (or a 100mm duct up to 125mm), giving a neat, airtight transition between the two sizes. Push-fit connections at both ends join straight to matching duct and fittings. Reducers are the simple way to connect fans, cooker hoods, grilles and appliances whose spigot size differs from the main duct run. The 100mm size is the standard choice for

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Buy from ALPHA AIR VENTILATION SUPPLIES LIMITEDALPHA AIR VENTILATION SUPPLIES LIMITED is a UK retailer, not the maker. Price seen 2026-09-26. Not an affiliate link, we earn nothing from it.

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The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.

UK company
Registered at Companies House as ALPHA AIR VENTILATION SUPPLIES LIMITED, number 08447300. Checked 2026-08-29.
Means the business is a British legal entity, not a British-sounding name owned elsewhere. It says nothing about where anything is made.
UK operations
Not yet checked.
Means people employed here, or premises they actually work from. We keep this separate from the company badge because a registered office can be an accountant's spare room, and a company can be registered in Britain while everything it does happens somewhere else. Where we have not looked, we say so rather than assuming.
British-owned
Not established. Many companies file a statement rather than naming a controlling shareholder.
Read from the register of people with significant control, following the chain of holding companies. It does not gate anything: a firm can be made here and owned elsewhere, and that is worth telling you rather than hiding.
Where it is made
The maker doesn't say, so neither do we.
This is about the individual product, not the company. A British firm can sell things made abroad, which is normal and not a criticism. We would rather tell you which is which than average them into a score.

Plastic Circular Ducting Reducer – 125mm – 100mm

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