Superior static cowl 8F – 15 x 20 cm

Superior static cowl in concrete with two long straight sides and two chamfered sides, for a flue from 15 x 20 to 20 x 50 cm that sits between two other flues. Both long sides are vertical, so the cowl fits between the cowls on the flues to the left and right.

Only the two short sides are chamfered and deflect rain and wind. In one direction the external size is therefore much smaller: type 6A for a 20 x 20 cm flue measures 30 x 42 cm. Like the other Superior cowls it has a base ring, two profiled intermediate rings and an open crown with bird mesh and deflector, in natural grey concrete. The rings turn rising wind, side wind and downdraught into negative pressure above the flue outlet. The draught stays stable and blow-back is prevented, without moving parts or a power supply.

Each flue gets its own cowl, sized to that flue. You order by the internal size.

The rings are dry-stacked and staggered on a clean, flat chimney top, so that the crown finishes level.

Which cowls go on the flues to the left and right? For the outer flues of the row one straight side is enough, on the side of the middle flue.

Can this cowl go on a freestanding flue? That is what the version with four chamfered sides is for, the standard version for a freestanding flue.

Is this a bemalkap? Yes. Bemalkap, bemal and tiratrek are the Flemish names for a static cowl. It is also called an anti-downdraught cowl or chimney cowl.