Burnham Series 8H/8HE Boiler Manual De Propietario

2)   support of common vent where it passes thru a 

ceiling or roof

3)   clearances to combustible material – use of 

thimbles

4)   firestops
5)   flashing and storm collars
6)   guying or bracing of common vent pipe above roof
7)   securing and gas tightness of joints
8)   lightning arrester if top of metal vent is one of the 

highest points on the roof

9)   proper termination of vent connection at masonry 

chimney – vent should enter chimney at a point 

above the extreme bottom of chimney – vent 

should be flush with inside of chimney and sealed 

(see Fig. 1-5)

10)  never connect a gas vent to a chimney serving a 

fireplace unless the fireplace has been permanently 

sealed

11)  never pass any portion of a vent system thru a  

circulating air duct or plenum.