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Assuming full ventilation the same pressure as atmospheric outside the building at the time. An open fire or solid-fuel stove will reduce it very slightly by the convection up the chimney, so it will draw in air from outside.
Wiki User
∙ 11y ago
Wiki User
∙ 15y agoIn the room will usually be the same as the outside atmospheric pressure. The standard atmosphere is defined as being 101325 pascals = 101.325 kPa.
Wiki User
∙ 9y agoAbout one "bar" or one "atmosphere" which is about 15 psi or 760.001 mm-Hg.
Obviously this will go up and down a little as the weather changes.
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