The Traditional 'OH' Cowl is designed to ensure that no matter what the wind direction or strength the flue or chimney is protected from downdraught. As the wind passes down the top of the external parts, it creates a wind flow that exhausts the smoke and fumes out of the lower exits.
Aluminium Gas Traditional 'H' Cowl - available sizes above
Due to the specific requirement for Chimney Cowls OH Cowl they are manufactured to order to ensure that the Cowl meets your needs - 'H' Chimney Cowls can at times take up to 5 working days which may affect your project deadlines especially when scaffolding/fitting costs need to be taken into consideration - as ever we will do our very best to ensure products ordered from Chimney Cowl Products are with you as timely as possible. We will ensure that we keep you update at all times.
So powerful is this action of the H Cowl that gusts of wind blowing through the air shafts produce an up-draught equal to about 30% of the velocity of the gusts. In normal weather, the O.H. Cowl possessing four outlets to the atmosphere improves any sluggish updraught.
Only the genuine O.H. Pot and Cowl has the exclusive design, which converts downdraught into an updraught no matter how strong or gusty the wind may be.