AMERICAN INSTITUTE. 



Gristoni's Improved Method of House Ventilation, 

 John H. Griscom, New York. 



UB 



The cut shows the elevation of the west wall of the residence of E. V. Hough- 

 wout, Esq., Gramercy Park (21st street), New York, showing the position and 

 connections of the heating and ventilating flues, illustrating Dr. Griscom's method 

 of ventilation. 



The light tinted tubes are the warm air, and the dark tinted are the ventilating 

 flues. The short connections between them, at the hot-air registers, are each com- 

 manded by a valve, V. * 



This method of ventilation is applicable to all houses which are warmed by 

 means of hot-air furnaces of any description. The arrangement consists in the 

 construction of independent ventilating flues in the walls of the house, in proximity 

 to the hot-air tubes, so that the two may be connected together by means of a 

 lateral or branch tubes, each containing a valve, V, by which a current of hot air 

 may at any time be transmitted from the hot-air tube to the ventilating flue. By 

 this means the ventilating flue (which terminates in the open air, like an ordinary 

 chimney) may be warmed by the hot air from the furnace, when the ordinary 

 hot-air register is closed, as at night in a dwelling, or in a school house after school 

 hours. The waste heat only of the furnace need be used for this purpose, as when 

 once well warmed, the interior of a ventilating flue will retain an elevated temper- 

 ature a greater or less length of time after the current of hot air is withdrawn. 



The ventilating flues should be constructed of brick or smooth stone, without 

 parging, so that the sides may be most readily warmed, and most easily impart 

 their heat to the air within. Thus constructed, if a hot-air register of a parlor, 



