# Plastic Back Box (Plenum Boxes) Top Entry - 250mm sq with 150mm dia spigot

> Price comparison in United Kingdom (GBP). Lowest price right now: **£40.10** at eFans Direct, currently out of stock. 1 offer from 1 shop. Checked 2026-10-09T20:57:07Z.

## Product
- Brand: eFans Direct
- Category: [Home & garden](https://pricuro.com/uk/home-garden.md) > [Tools](https://pricuro.com/uk/home-garden/tools.md)
- Manufacturer part number: GBEF252515
- Page: https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-250mm-sq-with-150mm-dia-spigot-2028667
- Image: https://pricuro.com/img/2028667/800/plastic-back-box-plenum-boxes-top-entry-250mm-sq-with-150mm-dia-spigot.webp

## Offers (1, sorted by total price incl. delivery; used/refurbished last)

| # | Shop | Price | Delivery | Total | Availability | Condition | Buy |
|---|---|---|---|---|---|---|---|
| 1 | eFans Direct | £40.10 | see shop | – | out of stock | new | https://pricuro.com/go/3288653 |

## Price history (lowest price per day in United Kingdom, tracked since 2026-10-03, 7 days)

- Lowest price today: £40.10
- Last 30 days: lowest £40.10, highest £40.10, average £40.10
- All-time low on Pricuro: £40.10 (2026-10-03)
- Note: the history is still short, so it does not yet show whether today's price is a good one.

| Date | Lowest price |
|---|---|
| 2026-10-03 | £40.10 |
| 2026-10-04 | £40.10 |
| 2026-10-05 | £40.10 |
| 2026-10-06 | £40.10 |
| 2026-10-07 | £40.10 |
| 2026-10-08 | £40.10 |
| 2026-10-09 | £40.10 |

## Specifications


Description (from a shop): The Plastic Back Box, also known as a plenum box, is a top-entry box that connects a circular duct to a square grille or louvre. Its durable plastic construction fits standard duct sizes and makes installation straightforward. Connects a circular duct to a square grille or louvre Top-entry spigot for the round duct Durable plastic construction, easy to install Smooths airflow behind the grille 15 combinations of square face (150 to 550mm) and spigot (100 to 315mm) Suitable for Joining round ductwork to square grilles and louvres Homes and commercial buildings, behind ceiling or wall terminals InstallationFits behind the grille or louvre, with the circular duct connecting to the spigot on the…

## Other variants

- [Plastic Back Box (Plenum Boxes) Top Entry - 200mm sq with 150mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-200mm-sq-with-150mm-dia-spigot-2028669.md) – from £25.88
- [Plastic Back Box (Plenum Boxes) Top Entry - 250mm sq with 100mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-250mm-sq-with-100mm-dia-spigot-2028671.md) – from £27.61
- [Plastic Back Box (Plenum Boxes) Top Entry - 225mm sq with 150mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-225mm-sq-with-150mm-dia-spigot-2028670.md) – from £26.40
- [Plastic Back Box (Plenum Boxes) Top Entry - 150mm sq with 100mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-150mm-sq-with-100mm-dia-spigot-2028668.md) – from £25.08
- [Plastic Back Box (Plenum Boxes) Top Entry - 450mm sq with 150mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-450mm-sq-with-150mm-dia-spigot-2028676.md) – from £32.76
- [Plastic Back Box (Plenum Boxes) Top Entry - 450mm sq with 250mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-450mm-sq-with-250mm-dia-spigot-2028678.md) – from £38.74
- [Plastic Back Box (Plenum Boxes) Top Entry - 350mm sq with 200mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-350mm-sq-with-200mm-dia-spigot-2028673.md) – from £32.98
- [Plastic Back Box (Plenum Boxes) Top Entry - 450mm sq with 200mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-450mm-sq-with-200mm-dia-spigot-2028677.md) – from £33.89
- [Plastic Back Box (Plenum Boxes) Top Entry - 300mm sq with 200mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-300mm-sq-with-200mm-dia-spigot-2028672.md) – from £30.65
- [Plastic Back Box (Plenum Boxes) Top Entry - 375mm sq with 200mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-375mm-sq-with-200mm-dia-spigot-2028674.md) – from £32.53
- [Plastic Back Box (Plenum Boxes) Top Entry - 450mm sq with 315mm dia spigot](https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-450mm-sq-with-315mm-dia-spigot-2028679.md) – from £33.89

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Source: Pricuro (https://pricuro.com), an independent price comparison for United Kingdom. Canonical page: https://pricuro.com/uk/p/plastic-back-box-plenum-boxes-top-entry-250mm-sq-with-150mm-dia-spigot-2028667
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