As a guide
to this, we have the following calculation: On an average, every adult
vitiates about half a pint of air at each inspiration, and inspires
twenty times a minute. This would amount to one hogshead of air vitiated
every hour by every grown person. To keep the air pure, this amount
should enter and be carried out every hour for each person. If, then,
ten persons assemble in a dining-room, ten hogsheads of air should
enter and ten be discharged each hour. By the same rule, a gathering
of five hundred persons demands the entrance and discharge of five
hundred hogsheads of air every hour, and a thousand persons require
a thousand hogsheads of air every hour.
In calculating the size of registers and conductors, then, we must
have reference to the number of persons who are to abide in a dwelling;
while for rooms or halls intended for large gatherings, a far greater
allowance must be made.
The most successful mode before the public, both for warming and
ventilation, is that of Lewis Leeds, who was employed by government
to ventilate the military hospitals and also the treasury building at
Washington.
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