10
Table 6.2a: Summary of Horizontal Venting Options
VENT OPTION # 1 2 3 45
CLASSIFICATION USED IN THIS
MANUAL
HORIZONTAL
DIRECT VENT
HORIZONTAL
DIRECT VENT
(RESERVED
FOR FUTURE
USE)
(RESERVED
FOR FUTURE
USE)
(RESERVED
FOR FUTURE
USE)
ILLUSTRATED IN FIGURE 6.1 6.1
VENT PIPE STRUCTURE
PENETRATION WALL WALL
AIR INTAKE PIPE STRUCTURE
PENETRATION WALL WALL
VENT PIPE SIZE 3” 4”
AIR INTAKE PIPE SIZE 4” 4”
MAXIMUM VENT PIPE
LENGTH
CHG150 55 FT N.R.
CHG225 N.R. 55 FT
MAXIMUM INTAKE
PIPE LENGTH
CHG150 60 FT N.R.
CHG225 N.R. 60 FT
EXHAUST TERMINAL 3” 90 ELBOW
OR TEE
4” 90 ELBOW
OR TEE
AIR INTAKE TERMINAL 4” 90 ELBOW 4” 90 ELBOW
VENT MATERIAL APPROVED VENT SYSTEM
SHOWN IN TABLE 6.5
AIR INTAKE MATERIAL GALVANIZED OR PVC
“N.R”-Notrecommended“N.A.”-Notapplicable
• Thebottomoftheventandairintaketerminalsmustbeatleast12”abovethenormalsnowline.Innocaseshould
theybelessthan12”abovegradelevel.
• Thebottomoftheventterminalmustbeatleast7feetaboveapublicwalkway.
• Donotinstalltheventterminaldirectlyoverwindowsordoors.
• Thebottomoftheventterminalmustbeatleast3feetaboveanyforcedairinletlocatedwithin10feet.
• Aclearanceofatleast4feethorizontallymustbemaintainedbetweentheventterminalandgasmeters,electric
meters,regulators,andreliefequipment.Donotinstallventterminaloverthisequipment.
• Donotlocatetheventterminalunderdecksorsimilarstructures.
• Topofventterminalmustbeatleast5feetbeloweves,softs,oroverhangs.Maximumdepthofoverhangis3ft.
• Ventterminalmustbeatleast6feetfromaninsidecorner.
• Undercertainconditions,waterintheuegasmaycondense,andpossiblyfreeze,onobjectsaroundtheterminal
includingonthestructureitself.Iftheseobjectsaresubjecttodamagebyuegascondensate,theyshouldbe
movedorprotected.
• Ifpossible,installtheventandairintaketerminalsonawallawayfromtheprevailingwind.Reliableoperationof
thisboilercannotbeguaranteediftheterminalissubjectedtowindsinexcessof40mph.