Plastic Circular In-line Back Draught Shutter – 150mm

Alpha Air Ventilation Supplies

£4.64

Back-draught shutter for plastic ventilation ducting lightweight gravity flaps close when the fan is off to keep out draughts, cold air and fumes. 150mm in-line back draught shutter for round plastic ducting a rigid plastic fitting with lightweight gravity flaps that open with the airflow when the fan runs, then drop closed when it stops. Fitted in-line within a 150mm duct run, it keeps out cold draughts, backflow and outside odours without restricting extract performance. Back draught shutters are a simple upgrade for any extract system: they stop chilly air blowing back through a bathroom fa

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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 In-line Back Draught Shutter – 150mm

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