Vermont Casting SDDVRBS manual Horizontal Installation, Supporting DIRECT-TEMP Horizontal Support

Stardance Direct Vent - Rear Vent Gas Heaters

Supporting DIRECT-TEMP: Horizontal Support

Horizontal runs of Direct-Temp should be supported every 4’ (122 cm) of pipe. This can be done with the use of plumbers strapping or the offset support.

Adjustable Length (AJ)

An Adjustable Length is available to accommodate installations where non-standard lengths are necessary. The adjustable length telescopes down over a standard length of pipe and provides an extension range of 3¹⁄₂” (89 mm) to 10¹⁄₂” (267 mm). Install by sliding the inlet end of the adjustable length over the outlet end of a standard length of pipe. After positioning the adjustable length appropriately, secure it to the standard length with two (2) #8 x1/4” sheet metal screws (provided). Seal the area between both the top and bottom of the adjustable length outer wall and the outer wall of the standard length with an approved silicone sealant.

Fire Stopping

DIRECT-TEMP must be firestopped wherever it passes through floors, ceiling or walls. The only location where a firestop is not required is at the roof level. Both verti- cal support components with trim plates provide for firestopping. The wall thimble also acts as a firestop. at other locations, a firestop spacer (FS) should be in- stalled. In the attic the firestop should be placed on top of the joist framing to prevent debris from falling into the joist framing. (Fig. 41)

from traffic areas such as walkways if it is less than 7’ (2.1 m) high. Refer to Pages 10, 11, Figures 11, 12 for more detail.

2.Assemble the pipe (and elbow if using) and attach it to the appliance. Plan for a level to 1/4” per foot rise (6 mm per 305 mm) (from inlet to outlet) in the horizontal system if not specified by the appliance manufacturer. Horizontal runs should be supported every 4’ (122 cm).

Snorkel Termination

Window Well

	12” (305 mm) Minimum
Maintain 2”	Clearance Above Grade Level to
(51 mm)	Air Intake
Clearance	Grade Level
Below Snorkel
	Sloped Away
	From Building
Adequate
Drainage as per
Local Codes
	ST929

Fig. 42 Below grade installation.

3.	Push the appliance near the desired location. Deter-
mine the centerpoint of the penetration by locating the
centerline of the outlet of the pipe with respect to the wall.
4.	Frame an opening to the dimension specified in the
Framing Dimension Table 1. Ensure the centerline of

Firestop (FS) Placed on Top of Framed Opening

Attic Framing (No floor)

Maintain at Least Minimum Clearance to Combustibles, Wire and

Insulation ST928

the pipe lines up with the center of the prepared open-

ing unless otherwise specified by the appliance manu-

facturer.

NOTE: As a general rule, the wall thimble is optional in the U.S. However, there may be some manufacturers that require it. Contact the appliance manufacturer for information if uncertain. When installed in Canada, a wall thimble is required on all installations in which the vent passes through a combustible wall.

5. If required, install the outside half of the wall thimble

Fig. 41 Firestop spacer.

Horizontal Installation

1.Determine the appliance location. Refer to the appli- ance manufacturer’s installation instructions for clear- ance to combustible requirements, termination options, number of elbows, maximum length, etc. Then posi- tion the appliance and plan vent routing accordingly. Consider locating the appliance in a place where there will be no interference with wall studs, electrical wir- ing, conduit, plumbing pipe or other obstructions. The termination should be located at least 12” (305 mm) (Fig. 42) above grade, remain above the snow line in geographical areas that accumulate snow and be away

(WT) through the opening and screw or nail in place. (Fig.

43) Seal around the perimeter of the thimble face plate on

the exterior wall using an RTV silicone sealant to provide

protection from possible rain infiltration. (Fig. 43)

NOTE: The wall thimble accommodates wall thickness- es of 4¹⁄₂” (114 mm) to 7¹⁄₂” (191 mm). If a larger range is needed due to a thicker wall, it is permissible to field fabricate a metal sleeve extension and attach it to the shields.

6.Install the horizontal termination to the exterior wall using four (4) all purpose screws through the holes located at each corner of the termination. Make sure the arrow (embossed on the front of the termination) is pointing up. (Fig. 44) If the house has vinyl siding,

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