A Combimaster is intended for installation on ventilation and air ducts. It can be used on gas-fired appliances. However, this can shorten the lifespan due to aggressive substances in the smoke emissions. That is why a Combimaster in stainless steel is the solution. The Combimaster stainless steel is not suitable for fireplaces, wood stoves or multi-fuel stoves. For this we recommend the Firemaster Aspirotor or Topmaster. A Combimaster stainless steel keeps rain out of your chimney. Rain can cause a lot of inconvenience over time: think of wet spots that come through the wall, cement that starts to come loose, hail and the like. With the new Combimaster stainless steel you can prevent this inconvenience because prevention is cheaper than cure. Bird nests and other blockages are also frequently heard complaints about chimney ducts. Complaints such as stench in the bathroom, a clogged extractor hood and a toilet that cannot get rid of its odours. Sometimes the problem can be solved by removing the nest or by chipping stones out of the wall. In this case too, prevention is better than cure, because with the new Combimaster RVS, a bird doesn't stand a chance. Rain caps rust, which is not always appreciated by a chimney sweep. But the Combimaster RVS, which is universally mounted and has a sweeping hatch, never has to be removed from your chimney. An indestructible cap on your chimney is not an unnecessary luxury but offers a guarantee to prevent a lot of inconvenience in the future.