Document mBjn3NejZKVZVw63LE7w16Rd0

American Society of Heating and Ventilating Engineers Guide, 1931 Chapter 6---Gravity Warm Air Heating Leader sizes should in general be not less than obtained by equations (1) to (3) nor should leaders less than 8 in. in diameter be used. It is not considered good commercial practice to specify diameters except WD <H HU z 5U4< VI P(A 2a ` > wH cn 3w H < &(Ws. wts, CZ5 Pb<) X 2 in whole inches, although there is no real reason for not using half inches if necessary. The tops of leaders should be at the same elevation as they leave the furnace bonnet, and from this point there should be'a 98 99 X