A H cowl is one of the best preforming anti down draught chimney cowl. H Cowls are suitable for most conventional clay chimney pots with an 8 inch (200mm) internal and 91/2 inch (240mm) external diameter. H Cowl is designed to prevent foreign bodies entering chimneys, to increase updraught and to prevent rain entering the chimney.
 
H Cowl For 9″ Clay Chimney Pot
 
A (mm)
B (mm)
C (mm)
D (mm)
600
450
ø198
ø150
 
 Promote positive updraught
 Fits most conventional chimney pots
 Use on chimneys in downdraught situations
 Durable construction, quick and simple to install
 Prevents rain ingress.