Installation Guide

ManualsBrandsDuraVent ManualsClass A Chimney PipeDuraVent 12" Inner Diameter - DuraTech Class A Chimney Pipe - Double Wall - Attic Insulation Shield

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properly). Level the Support Box and secure

it to the framing using at least three 8-penny

nails per side (min. of 12 total). Wrap the

straps of the Support Box around the framing

members (Fig 4), and secure with (2) 8-penny

nails per side (eight nails total). Alternatively,

you may use 1-1/2” #8 wood screws (min. of

12 total for the Support Box, and 8 total for

the straps), instead of nails. Next, secure

the round or square Trim Collar to the ceiling/

framing members using (4) 1” long, round-

head wood screws.

4. Frame Openings: Frame openings in

each ceiling or oor above the Support Box

(Fig 6). These openings are to hold the

Firestop Radiation Shield and Attic Insulation

Shield. Locate each opening by dropping a

plumb bob to the four corners of the opening

below. Maintain the minimum clearances and

dimensions as specied in Table 2. If Elbows

must be used to avoid an obstruction, refer to

the Offset Elbow Installation section.

5. Cut Roof Opening: Cut an opening in the

roof directly above the opening below, and

at least 4 inches larger than the chimney’s

outside diameter to provide at least a

2-inch clearance all around the chimney.

The chimney must be centered within this

Figure 7

Table 2

Inside Square Framing Dimensions

(X" x X")

Chimney Diameter 10" 12" 14" 16" 18" 20" 22" 24"

CEILING SUPPORT BOX

16 1/4" 18 1/4" 20 1/4" 22-1/4" na na na na

WALL THIMBLE

16" 18" 20" 22" na na na na

FIRESTOP RADIATION SHIELD

16" 18" 20" 22" 24 1/4" 26 1/4" 28 1/4" 30 1/4"

ATTIC INSULATION SHIELD

16 1/4" 18 1/4" 20 1/4" 22 1/4" 24 1/4" 26 1/4" 28 1/4" 30 1/4"

opening and maintain the 2-inch clearance to

combustibles.

6. Install Firestop Radiation Shield: A Firestop

Radiation Shield is required in multistory

installations at each oor penetration above

that where the Support Box is located.

Example: in a multistory home where the

appliance is on the ground oor (Support

Box is in the 1st oor ceiling), you would

need a Firestop Radiation Shield at the 2nd

oor ceiling, and at the 3rd oor ceiling, etc.,

FRAMING

FIRESTOP

RADIATION

SHIELD