Empire Comfort Systems DVLT42FP92N-2 Installation Instructions And Owner's Manual page 24

VENTING FRAMING AND FINISHING (continued)
Installing Support Brackets
Install a horizontal pipe support used for each 3 feet of horizontal run
to framing members. Allow 3 inches of clearance to combustibles
above 8 inch diameter pipe and elbows and 1 inches of clearance
on both sides and bottom.
Support vertical runs of this vent systems every 4 feet using wall
brackets attached to the vent pipe and secured with nails or screws
to structural framing.
Note: Maintain all clearances to combustibles as shown in Figures
1 to 4 on page 7.
Installing Firestops
Firestops are required for safety whenever the vent system passes
through an interior wall, an exterior wall, or a ceiling. These firestops
act as a firebreak heat shield and as a means to insure that minimum
clearances are maintained to the vent system.
Horizontal Firestops
Horizontal runs in the vent system which pass through either interior
or exterior walls, require the use of wall firestops on both sides of
the wall through which the vent passes.
Position the firestops on both sides of the framed hole, previously
cut. Refer to Figure 39 for sizing information. Secure firestop with
nails or screws. The heat shields of the firestops MUST BE placed
towards the top of the hole. Continue the vent run through the firestops.
Page 24
Figure 45
NOTE: SD58DVAWTEC Wall thimble is necessary to maintain
the required three inches of clearance to combustibles above
the vent. Framed hole dimensions shown above are for this wall
thimble.
Figure 39
34829-1-0115