Chimney cowls are the name given to any item that is placed at the top of your chimney stack or chimney pot .There are hundreds of different ones out there and they vary in design depending on what job you want them to do . The most common reasons to have a chimney cowl fitted are:
Rain and damp issues in the chimney
Birds nests or birds falling down chimneys
Downdrafts blowing smoke into the room
Chimney not drawing all the smoke away
Gravel and or soot falling down the chimney when its stormy
If your chimney is suffering from one of the above putting a cowl on may well help . The type of cowl you fit will also depend on what appliance is being used . The specifications for Gas and solid fuel cowls are different so the correct cowl must be selected.