Enviro C-10381, C-11290 owner manual Pipe and elbows may be utilized in the attic, as

Initial Installation

QUALIFIED INSTALLERS ONLY

Vertical Installation:

1.Check the instructions for required clearances (air spaces) to combustibles when passing through ceilings, walls, roofs, enclosures, attic rafters, or other nearby combustible surfaces. Do not pack air spaces with insulation.

2. Set the gas appliance in the desired location. Drop a plumb bob down from the ceiling to the position of the appliance flue exit, and mark the location where the vent will penetrate the ceiling. Drill a small hole at this point. Next, drop a plumb bob from the roof to the hole previously drilled in the ceiling, mark the spot where the vent will penetrate the roof. Determine if ceiling joists, roof rafters, or other framing will obstruct the venting system. You may wish to relocate the appliance, or to offset, to avoid cutting load bearing members.

3.To install the Round Support Box/Wall Thimble in a flat ceiling, cut a 10” square hole in the ceiling, centered in the hole drilled in Step 2. Frame the hole as shown in Figure 30.

4. Assemble the desired lengths of black pipe and elbows necessary to reach from the appliance adapter up through the Round Support Box. Insure that all pipe and elbow connections are in their fully twist-locked position.

5.Cut hole in the roof centered on the small hole placed in the roof from Step 2. The hole should be of sufficient size to meet minimum requirements for Clearance to Combustibles, as specified. Continue to assemble lengths of pipe and elbows necessary to reach from the ceiling

support box up through the roof line. Galvanized					Figure 30: Wall Framing for Hole for Vertical
pipe and elbows may be utilized in the attic, as					Installation.
well as above the roof line. The					Vertical
galvanized finish is desirable
					Termination
above the roof line, due to the
higher corrosion resistance.				Elbow Strap	Storm Collar
6. Once the pipe sections have					Flashing
been joined, and run up through
the hole in the roof, slip an elbow
strap over the exposed sections,					Roofing nails
bend	the	support	straps
outwards, and push the elbow
strap down to the roof level, as
shown in Figure 31. Tighten the
clamp around the pipe section.
Use a level to make sure the
pipe is	truly	vertical.	With
roofing nails, secure the support
straps to the roof. Seal the nails
holes heads with non-hardening				Figure 31: Vertical Vent Termination Installation.
mastic. Trim the excess length of

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