Calculate the low-level and high-level ventilation of a boiler room, according to NBN/DTD B 61-001, NBN/DTD B 61-002 and NBN D 51-003. Enter the boilers or gas appliances, their output, the building and the room. You see the free area needed for the air supply at the bottom and the air exhaust at the top, with a grille size and the size of a round, square or rectangular duct.

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