To escape the injuries arising from impure air it is necessary to attend
to the following rules: To avoid the admission into closed apartments of
air charged with any substance that offends the sense of smell. To avoid
surcharging the air with vapour of water. To keep the temperature in
every room as nearly as possible at the safe standard of 60° Fah. To
take ample means of allowing air to escape from the room by every
available outward draught, by the chimney flue especially. To admit air
freely at all times, and, when a room is not in use and the external air
is not charged with moisture, to allow the entrance of air from without
through every window and door.