By increasing or decreasing the opening of the chimney you can control & limit:
Important: This cowl will not prevent a downdraught when open.
Important: This cowl cannot be used with a stove, boiler or any closed appliance.
Each chimney control pack contains:
Diameter: 12 Inch (305mm)
Open Height: 8 1/2 Inches (214mm)
Closed Height: 5 Inches (125mm)
How to Install:
Tags: Chimney Cowls