Knitted Wire Catalytic Converters
Knitted wire grease filter from a rapid-cook oven
Knitted wire is often used to make grease filters for cooking appliances but these only trap larger particles and require frequent cleaning to prevent them becoming blocked. Some ovens incorporate a separate catalytic converter based on the conventional honeycomb structure to reduce smaller particles and smells against which the grease filter is ineffective. However, by applying a catalytic coating to a knitted wire filter it can function as a catalytic converter too, with the result that much of the organic material which passes through it will be oxidised into inoffensive carbon dioxide and water vapour.
A further advantage is that filter cleaning intervals will be extended, as long as the temperature of the gas passing through it is generally over 225°C (440°F). For this reason, catalytic converters based on knitted wire are ideal for cooking appliances where the hot air is recirculated, such as rapid-cook ovens.