Chimney Sheep Square 13″ x 13″ (33cm x 33cm)


A 100% Herdwick wool square draught excluder to stop chimney draughts. Dimensions: 13” x 13” (33cm x 33cm), suitable for chimneys 8″ – 12″ x 8″ – 12″ (200 – 300mm x 200 – 300m). This is a versatile size with an extra row of stitching so it can be trimmed to fit if necessary with a pair of sharp scissors. If you’re not sure what size to get have a look at the sizing chart.

SKU: NCA007 Category:

Credited by Kevin McCloud and DIY Doctor, this square chimney draught excluder is a versatile size that fits a large range of chimney sizes and shapes. It fits perfectly into a square, oblong or D shaped chimney flue to instantly stop cold chimney draughts and save you tens of pounds in electricity bills. It has an extra layer of stitching so it’s designed to be trimmed to fit narrower gaps if necessary. The wool is very compressive so can be squashed or tucked in to fit most chimneys, but if necessary you can trim off the excess.

Handmade in the English Lake District from the wool of the native Herdwick sheep, the breathable yet highly durable material is the optimum texture and thickness to stop chimney draughts. The draft excluder pad is made of two layers of thick felt to withstand strong wind and chimney debris, but still permits ventilation to avoid damp issues. Another benefit of sheep’s wool is its hygroscopic properties. This material cleverly absorbs moisture if any rain gets down the chimney and wicks it away through evaporation when conditions are dry again.

Rigorously tested by BSRIA and University of Liverpool, your new fireplace draught excluder is easy to install and can be customised to fit the exact measurements of your chimney flue.

What size Chimney Draught Excluder do I need?

When purchasing a Chimney Sheep, make sure to order one that it’s 1-2 inches larger than the width of your chimney flue. This will allow the sides of the wool head to fold into place and  lodge firmly against the walls of its new home.

To install your chimney draught excluder and start instantly reducing chimney draughts, all there is to do is:

  • Push the wool head into the narrow part of your flue
  • Gently tug it down to secure it
  • Once in place, the Sheep will act similarly to a chimney plug by gripping to the sides of the flue – with the added bonus of breathability.

The 13″ x 13″ Chimney Sheep is stitched 3 inches (8cm) in from the edge to allow space for customisation. It’s suitable for oblong and square chimney flues measuring from 8″ x 8″ (20cm x 20cm) to 12 x 12 30cm x 30cm).

If you are unsure of how to measure your flue and choose the correct size, please take a look at the How to Use page and the Sizing Chart. And if you need an extension rod for this product, make sure you order a ‘chunky’ one.

How much energy will stopping chimney draughts save me?

Lots of warm, expensive energy is lost up an open chimney. Having an open chimney is like leaving a window open all the time.  Reducing chimney  draughts therefore doesn’t just save energy and costs, it saves draughts from other parts of the building. Acting as the perfect chimney draught solution, a Chimney Sheep will also reduce noise levels and restrict debris from falling down your flue – all part of the bargain.

Product Review of the Chimney Sheep from diydoctor on Vimeo.