A bird creates a nest in a chimney by dropping nesting material down the flue until it stops, then building up from there. The nest can be at the bottom, or near the top of the chimney and therefore it is possible to have the entire flue filled with a nest.
A blocked flue can have potentially devastating effects. A blockage can be lethal due to a build up of carbon monoxide gases. The gases have nowhere to escape except back through the chimney into your room. This can be especially dangerous if you have a gas fire.
We supply and fit a variety of cowls and birdguards.