Vermont Casting RADVTCEB Benutzerhandbuch

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The Cathedral Ceiling Support (CCS) may be used in 
pitched or flat ceiling installations and comes with a 
support collar and a decorative two part square trim 
plate. Install by inserting the support box down through 
the framed joist opening (end with round hole first) in 
the ceiling using tin snips, cut the corners of the open 
end of the box such that the sides can be folded down 
over the top of the joist framing members. Nail the 
folded sides to the top of the framing. (Fig. 37)

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Two Part Square 
Trim Plate

Support Box

Support Box Collar

ST926

Fig. 37  Support box.

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Nail to top of 
framing

Offset Support 
Strap

Offset Support 
Collar

ST927

Fig. 38  Offset support.

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Firestop (FS) 
Placed on Top 
of Framed 
Opening

Attic Framing
(No floor)

Maintain at Least 
Minimum Clearance to 
Combustibles, Wire and 
Insulation

ST928

Fig. 39  Firestop spacer.

A two-part square trim plate is provided to give a fin-
ished look once installed. Simply fit the two halves of 
the trim plate around the cathedral ceiling support box 
hanging below the ceiling (overlapping if necessary) 
and screw them to the ceiling. Both the ceiling support 
and cathedral ceiling support can support a maximum 
of 40’ (12 m) of pipe.
Offsets:
If any offsets are necessary in the vertical system, an 
Offset Support (OS) should be installed directly above 
the upper elbow of the offset. Install by attaching the 
offset support band to the pipe with two #8 x 1/4” sheet 
metal screws (minimum ) and secure the offset support 
straps to surrounding structure. (Fig. 38)

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 
installed. In the attic the firestop should be placed on 
top of the joist framing to prevent debris from falling into 
the joist framing. (Fig. 39)

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. 40) above grade, remain above the snow line in 
geographical areas that accumulate snow and be away