The
openings into the exhausting air flue should vary from eight inches
to twelve inches square, or more, according to the number of persons
who are to sleep in the room.
The time when ventilation is most difficult is the medium weather in
spring and fall, when the air, though damp, is similar in temperature
outside and in. Then the warm-air flue is indispensable to proper
ventilation. This is especially needed in a room used for school or
church purposes.
Every room used for large numbers should have its air regulated not
only as to its warmth and purity, but also as to its supply of moisture;
and for this purpose will be found very convenient the instrument
called the Hygrodeik, [Footnote: It is manufactured by N. M. Lowe,
Boston, and sold by him: and J. Queen & Co., Philadelphia.] which shows
at once the temperature and the moisture. A work by Dr. Derby on
Anthracite Coal, scientific men say has done much mischief by an
_unproved_ theory that the discomfort of furnace heat is caused by the
passage of carbonic _oxide_ through the iron of the furnace heaters, and
_not_ by want of moisture. God made the air right, and taking out its
moisture _must_ be wrong.
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