25613-0-0309Page 30
Termination clearance for buildings with combustible and noncombustible exteriors.
Vertical Sidewall Installations
Important! Minimum clearance between vent pipes and combustible materials is three (3") (76 mm) on top, and (1") (25 mm) on bottom
and sides.
Important! When vent termination exits through foundation less than 20" below siding outcrop, the vent pipe must extend outward so
that the horizontal vent terminal is located ush to, or beyond the outcrop siding.
Information on Various Venting Routes and Components
Important: It is always best to locate the replace in such a way that minimizes the number of offsets and horizontal vent length.
Since it is very important that the venting system maintain its balance between the combustion air intake and the ue gas exhaust, certain
limitations as to vent congurations apply and must be strictly adhered to.
The graph showing the relationship between vertical and horizontal side wall venting will help to determine the various vent lengths
allowable.
The horizontal vent run refers to the total length of vent pipe from the ue collar of the replace to the face of the outer wall.
The maximum horizontal vent run is 20 feet (457 cm) when the vertical vent rise is 8 feet (244 cm). See Figure 17.
Venting terminals shall not be recessed into wall or siding.
Figure 46
RECESSEDLOCATION
OUTSIDECORNER
INSIDECORNER
“A”= COMBUSTIBLE 9” (229mm)
=NONCOMBUSTIBLE 2” (51mm)
“F”=COMBUSTIBLE6” (152mm)
=NONCOMBUSTIBLE 6” (152mm)
BALCONY
WITHPERPENDICULAR SIDE WALL
BALCONY
WITHNO SIDE WALL
“C”=CLEARANCEFROM CORNER
INRECESSED LOCATION
COMBUSTIBLE9” (229mm)
NONCOMBUSTIBLE2” (51mm)
“D”=MINIMUMWIDTH FOR BACK WALL
OFA RECESSED LOCATION
COMBUSTIBLE38” (965mm)
NONCOMBUSTIBLE24” (610mm)
“E”= MAXIMUM DEPTH OF 48” (1219mm)
FORRECESSED LOCATION
“G”=COMBUSTIBLE9” (229mm)
=NONCOMBUSTIBLE 2” (51mm)
“H”=COMBUSTIBLE18” (457mm)
=NONCOMBUSTIBLE 12” (305mm)
“I”=COMBUSTIBLE18” (457mm)
=NONCOMBUSTIBLE 12” (305mm)
TERMINATION CLEARANCES