There are various kinds of fans which may be used. Those which change their direction in process of revolution are good. Some think they are better than the one-direction fan, and maybe, where the fan is used alone without other attachments such as purifiers and blowers, this style may be more efficient. It at least does the work more swiftly. But whatever kind you use, they should be so placed as not to make draughts. The steady movement of air is the only thing necessary, not hurricanes. In the study it is necessary to have light and air and no draughts to blow papers away. The ventilator (which may be put on the window sill over the radiator thus obviating the uncertain winds coming crassly through the open window) will prove a boon to the writer or housewife. Oh, Homekeepers, it is often that these office devices which are always employed where work is done, if installed at home, would keep your men folk and even your women office workers happy. You would be surprised how many people would come home to do after-hour work if the home were as office-shape as business places. And the ventilator is a very good point at which to start. It is nice to think that along with ice cream, the steam boat, and other American inventions, applied ventilation seems to be an almost pure American product! So, you patriots, here is a way to build real air castles that will build finer and finer things as you profit by the stimulus which fresh air, more than any one commodity in the universe, can give. WEATHER STRIPS AS AID IN VENTILATION No consideration of ventilation of houses could be complete without a few words on the value of weather strips. It is strange too that this precaution in the home is so little known and that the house-wife has so little knowledge of their infinite good. Disregarding them as a factor in the cleanliness and noiselessness of the home, disregarding in this chapter the intriguing facts of their manufacture and application, they are adjunct at their best in the home because: They reduce the possibilities of draughts and therefore reduce the possibilities of colds and rheumatism and the like. See Chapter XXXIII. They keep the temperature of all the rooms as even as it is possible here below to keep anything even and therefore give the ventilating régime a square chance to function well. In keeping welcome air in and unwelcome air out, in so far as is necessary, the reduction of fuel bills is enormous ... from 15 to 50%! This to-day is a favorable asset when fuel is expensive. With all the systems of ventilating in the world, if you have tornadoes flying about your floors from the air you do not wish admitted, you cannot have a properly or healthfully ventilated home.