HEATING AND VENTILATING 



THE building is heated by a double-pipe over- 

 head-fed vacuum return steam system, with 

 automatic thermostatic temperature regula- 

 tion. Exhaust steam from the engines is used for 

 the heating, supplemented by live steam supplied 

 through a pressure-reducing valve. 



Practically, the entire building is heated by direct, 

 pressed steel radiators. In the important rooms, 

 such as the north banking room in the 1st story, 

 and the principal offices of the Company in the 33d 

 and 34th stories, these radiators are enclosed in 

 ornamental bronze screens. 



The main corridor on the ground floor, also the 

 safe deposit vaults in the basement, are heated by 

 an indirect system, the heating surface of which is 

 located in a central stack room in the basement. 



The fresh air supply for this indirect system is 

 obtained from the large light court at the rear of the 

 Bourne Building and Bourne Building Addition. 

 The air is drawn through a water air-washing device 

 and a tempering coil by means of direct connected 

 electrical blowers, after which it is forced through the 

 stack chamber and ultimately delivered into the 

 rooms through galvanized iron ducts and ormanental 

 bronze registers. All parts of this system are ther- 

 mostatically controlled. 



The piping system for supplying the radiation 

 throughout the Tower consists of a 12-inch riser, ex- 

 tending from the basement, back of elevator No. 6, 

 to the 39th floor. Here it supplies a horizontal 

 main from which are fed risers ascending to the 

 45th and descending to the 13th Mezzanine floor; 

 the latter have expansion loops in the 31st and 21st 

 stories. 



The return risers, corresponding to the above, 

 fall to the 13th Mezzanine, where they are collected 

 into one 4-inch return riser, extending down to the 

 basement, behind elevator No. 6. 



The lower part of the building is supplied by 

 a 10-inch riser extending to the 13th Mezzanine 

 floor, where it branches horizontally and feeds a 

 number of down supply risers. The return risers 

 run parallel to the supplies. Each has one expansion 

 loop. The main risers have expansion slip joints, 

 the 12-inch riser having two. All risers are valved 

 independently. 



Most of the radiator connections are run under 

 the floors with galvanized iron covers over them. 

 Practically, all radiators are thermostatically con- 



[ 63 



trolled on the supplies and all have vacuum valves 

 on the returns. 



All piping is covered with 85 per cent, car- 

 bonate of magnesia, canvas jacketed, except radi- 

 ator connections under floors, which have air-cell 

 coverings. 



All toilet rooms are ventilated through registers, 

 into shafts extending upward, from which the air 

 is exhausted by means of direct- 

 connected electrical fans, the princi- 

 pal one of which is 70 inches in diameter, located on 

 the 39th floor. 



The heated air from the engineering department 

 is exhausted by means of a large fan delivering to a 



VENTILATING 



VFNTII ATION 



\E MCrHA w irAi the air exhausted is drawn > 

 OF MECHANICAL , f f r u . e 



FOUIPMFNT g space in rear of 



building. At the intake of this 

 duct there is a corrugated iron and glass house, con- 

 taining a Webster Air Washer and Humidifier, which 

 presents novel features of construction. 



The air to be washed, humidified or cooled passes 

 first into the spray chamber where it is thoroughly 

 washed and cleansed by passing through from two 

 to four sheets of water, having a combination "rain- 

 and-spray" effect. 



The " rain-and-spray " effects, produced by special 

 patented copper heads, were selected because it was 

 found that sheets of rain more effectually removed 

 dust and dirt from the air, whereas sheets of finely 

 divided spray, on account of the more intimate con- 

 tact possible between the air and water, had a greater 

 cooling effect. 



After leaving the spray chamber the air passes 

 through the eliminator, where all entrained water or 

 unevapo rated moisture is entirely removed, thence 

 through to the ventilating system into the building. 



The special feature of the Webster Eliminator is 

 the use of horizontal baffle plates, superior to the 

 various vertical types generally used, in that any 

 entrained water deposited upon the baffle plates is 

 carried off at once horizontally to a gutter and re- 

 turned to the water tank, thus preventing re-contact 

 with the lower strata of air passing through the 

 eliminator. 



A water tank or sump contains the spray water, 

 which is circulated at from 2 to 20 pounds hydro- 

 static pressure by means of a centrifugal pump, elec- 

 trically operated from the main power plant. 



