(Posted from a thread on installing a gas cooker, but thought I'd ask the question separately here.)
Is a domestic gas hob an open-flued combustion appliance? If so, then the extract rate in a kitchen should not be greater than 20l/s (Part J, 1.20.a). But in the part which covers ventilation, I'm sure I've read that the extract rate must be greater than 30l/s. What have I misunderstood?
No. A domestic gas hob is a flueless combustion appliance, not an open flued one. There are exceptions. Agas and Rayburns are normally open flued, for example, but they can't be described as hobs, really. The most likely open flued appliance in a kitchen is an old boiler.
Ventilation in a kitchen should be high to remove smells and moisture. However, having a high extract rate can make open flued appliances dangerous as it can pull exhaust fumes into the room instead of going up the chimney. As this can lead to carbon monoxide poisoning and death, this takes precedence.
Christian.
Thanks Christian. I knew it was probably a simple mistake that I made.
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