Mechanical Contracting & Plumbing January-December 1908 . Kig. 2—lUiistrating Conversion of anyHadialor to Direct-Indirect Type. vidcd, thoroughly warmed, by the heat-ing ai)paratus, to the proper tempera-ture. One of the best and most widelyKnown methods of ventilation is em- Thc box or case enclosing the radia-tor is made of seasoned wood, linedwith asbestos and bright tin. The sidesof the box almost touch the ends andsides of the radiator, so that the coldair getting in through the duct is com-pelled to pass up through the sectionsof the radiator on its way to the roomsabove. In the constru
Mechanical Contracting & Plumbing January-December 1908 . Kig. 2—lUiistrating Conversion of anyHadialor to Direct-Indirect Type. vidcd, thoroughly warmed, by the heat-ing ai)paratus, to the proper tempera-ture. One of the best and most widelyKnown methods of ventilation is em- Thc box or case enclosing the radia-tor is made of seasoned wood, linedwith asbestos and bright tin. The sidesof the box almost touch the ends andsides of the radiator, so that the coldair getting in through the duct is com-pelled to pass up through the sectionsof the radiator on its way to the roomsabove. In the construction of the airduct, care should be taken to provide aslide as shown in the accompanying il-lustration, so that the air may be cutoff, when the radiator is not in use. Another efficient form of ventilationis made possible by converting anyradiator into a direct-indirect radiatorby means of a cast iron box base shownin the above illustration. The mission of the direct-indirect orventilating radiator is the same as the. Fig. .S—Wall 15ox or Kresh Air Inlet. indirect radiator, namely, to permit theoperator to supply plenty of warm,fresh air, forcing out the inqjuritieswhich are naturally j)resent in therooms above. 1 he box base t-o be effi-cient .should be equipped with a device 10 January 8, 1908 PLUMBER AND STEAMFITTER so that either the bottom or back inletcan be used. The wall box, or fresh air inlet, asillustrated above, is placed on the out-side of the wall, and is equipped witha close meshed brass cloth which pre-vents leaves and other foreign matterfrom interfering with the passage offresh air through the air duct into thebox base. There are two ways of moving airfor ventilating purposes ; first, by ex-pansion due to heating, second, bymechanical means. We have considered the former method(by heating) in the preceding para-graphs, but ventilation by mechanicalmeans is of equal, if not greater im-portance, as the erection and construc-tion of buildings often interfere
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