Casselin CFRPG430 Manual De Instrucciones página 54

Type "a" devices (see nameplate)
Products of combustion from type "A" gas appliances must be vented into a special hood or similar device,
connected to a chimney of safe efficiency, or directly to the outdoors.
Otherwise the use of an air extractor connected directly to the outside, with a range no less than what
is established in the installation rule is allowed.
The appliance must be installed in a well ventilated place to avoid an excessive concentration of substances
harmful to health in the place where it is installed.
The air range necessary for combustion must be 2 m3/h/ kw oven
power, plus 35 m3/h in the environment for the well being of the
person.
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