A downdraft occurs when external wind pressure forces air back down the chimney, pushing smoke and combustion gases into the room instead of allowing them to escape. Anti-downdraught cowls are specifically engineered to prevent this by stabilising airflow and maintaining a consistent upward draw.

Modern cowls are designed using aerodynamic principles to control how wind interacts with your chimney. Rather than allowing wind to enter the flue, these cowls redirect and accelerate airflow across the chimney terminal.

• Static Anti-Downdraught Cowls
  Fixed designs that deflect wind away from the flue opening. Reliable, low maintenance, and ideal for exposed locations.
• Rotating (Spinning) Cowls
  Wind-powered units that rotate to actively extract air from the chimney, increasing draw in difficult conditions.
• H-Style Cowls
  Engineered to neutralise crosswinds and stabilise pressure. Particularly effective on tall or exposed stacks.
• Universal Anti-Downdraught Cowls
  Versatile options suitable for solid fuel, gas, and oil appliances with combined rain and bird protection.

Quality matters. Poorly made cowls fail quickly and often worsen airflow issues.

• Stainless Steel: Long life, corrosion resistant, ideal for coastal and exposed environments
• Galvanised Steel: Cost-effective with good durability for standard installations
• Aluminium Components: Lightweight, often used in rotating designs

A cowl WILL help if:

• Wind direction is causing intermittent smoke blowback
• The property is exposed or surrounded by taller structures
• The chimney draw is inconsistent

A cowl may NOT solve the issue if:

• The flue is undersized or incorrectly designed
• There are internal blockages or poor maintenance
• The appliance installation is non-compliant