M&G DuraVent DuraTech® 5-8 - Manual (Page 5)

5
CHIMNEY DIAMETER
Follow the appliance manufacturer’s
instructions to determine chimney diameter
and clearances between combustible materials
and your heating appliance. Never choose
a chimney with an inside diameter smaller
than your appliance’s outlet. To calculate the
chimney’s outside diameter, add 2 inches to
the inside diameter.
CHIMNEY HEIGHT
The National Fire Protection Association
Standard #211 states: “Chimneys shall extend
at least three feet above the highest point
where it passes through the roof of a building,
and at least two feet higher than any portion
of a building within ten feet.” (Fig 1) DuraTech
Chimney may be installed up to 60 feet high. If
the chimney extends more than 5 feet above
Figure 1
Figure 2
DuraTech Chimney Components
6”, 12”, 18”, 24”, 36”, 48” pipe
sections
Firestop Radiation
Shield
Elbow with swivel Attic Insulation Shield
Tee with Tee Cap Elbow Strap
Adjustable Tee Support Bracket Adjustable Wall Strap
Chimney Cap
Anchor Plate
Round Ceiling Support Box Extended Roof Bracket
Trim collars for Round
Support Boxes
Adjustable Roof
Flashing
Square Ceiling Support Box Chase Top Flashing
Flat Ceiling Support Box Flat Roof Flashing
Roof Support Storm Collar
Trim collar for Roof Support Transistion Anchor Plate
Wall Thimble Base Tee and Double
Base Tee
Finishing Collar Firestop
Reduced Clearance
Support Box
CAS Ceiling Support
Table 1
2 FT MIN ABOVE HIGHEST
POINT OF ROOF WITHIN
10 FT
10 FT
3 FT MIN
ABOVE
ROOF
ATTIC
INSULATION
SHIELD
FIRESTOP
RADIATION
SHIELD
(INSIDE)
ENCLOSURE
MUST HAVE 2
INCHES OF
CLEARANCE
BETWEEN
CHIMNEY AND
WALL
SUPPORT
BOX
FIRST
FLOOR
OCCUPIED
SECOND
FLOOR
ATTIC
SPACE
the roof, an Extended Roof Bracket must be
used (see page 12). Due to the overlap of the
joints, subtract 1-1/4 inches from each Chimney
Section’s height to calculate installed height.