Safe Ways To Reduce Clearances; Fireplace And Mantel Trim Shields; Wall Shields - Vermont Castings 1975 Owner's Manual

Defiant FlexBurn 1975 Non-Catalytic / Catalytic Wood Burning Stove
® ®

Safe Ways to Reduce Clearances

Clearance requirements are established to meet every
installation possibility, and they involve the combination of
these variables:
• When the stove pipe has no listed heat shield mounted
on it.
• When the wall has no heat shield mounted on it.
• When the wall has a heat shield mounted on it.
• When the wall and stove pipe have heat shields.
In general, the greatest clearance is required when you place
a stove and its connector near a wall with no heat shield.
For example, when the Defiant
wall and no connector shield is used, it must be at least 15"
(381 mm) from the wall behind it and at least 21" (533 mm)
from walls on either side. These dimensions are measured
from the top edge of the stove to the combustible wall.
If the Defiant is installed in a corner and no shield is used,
®
the corners of the stove top must be at least 5" (127 mm)
from nearby walls.
Clearances may be reduced only by means approved by the
regulatory authority, and in accordance with the clearances
listed in this manual. Refer to Page 14 for approved clearance
reduction specifications.
NOTE: A minimum ceiling height of 8' (2.4 m) is required for
all installations of the Defiant
NOTE: Installation of the Defiant
alcoves.

Wall Shields

One way to reduce clearances is with a wall shield
constructed of 24 gauge or heavier sheet metal, or of another
noncombustible material such as 1/2" (13 mm) insulation
board such as Durock or Wonderboard
®
"laid on flat," with the 31⁄2" (90 mm) side down.
Shields must be spaced out from the combustible surface 1"
(25 mm) on noncombustible spacers, as in Figure 13. The
spacers should not be directly behind the stove or chimney
connector.
Air must be able to flow between the wall and the shield. At
least 50% of the bottom 1" (25 mm) of the shield must be
open, and the shield must be open at the top. Metal screening
across the top will keep small stray objects from being trapped
behind the shield. (Figure 13)
The shield must be a minimum of 48" (1219 mm) tall, and
must extend at least 19" (483 mm) higher than the top of the
stove, whichever is higher. The shield behind the chimney
connector must be 30" (760 mm) wide, centered behind the
pipe; for installations that use an approved prefabricated
chimney to pass through the ceiling, the shield behind the
chimney connector must stop 1" (25 mm) below the ceiling.
With 8" connections and chimneys, because of potentially
higher pipe temperatures, the shield must extend the full
height of the wall (up to 9' (2.7 m)) and stop 1" (25 mm)
below the ceiling.
12
is installed parallel to the rear
®
.
®
is not permitted in
®
, or common brick
®
Vermont Castings • Defiant Flexburn Installation & Operating Manual_R32 • 04/17
Air Flow
Wall Shield
Stud Wall
Framing
Noncombus-
tible Spacers
and Fasteners
Drywall
Air Flow
Figure 13 - Approved wall shield construction.
ST248

Fireplace and Mantel Trim Shields

wall shield construction
A fireplace installation requires special clearance between
12/14/99 djt
the side of the stove and the right and left walls, between the
side of the stove and the decorative side trim on the fireplace
face, and between the top of the stove and the mantel.
N o n c o m b u s t i b l e s h i e l d s
installed 1" (25 mm) away from
the combustible surface on
noncombustible spacers, called
ventilated shields, may be used
to reduce clearances.
To protect a mantel from the
heat of a stove in a fireplace
installation, use a custom-made
ventilated mantel shield that is
at least 48" (1220 mm) long,
centered over the stove. (Figure
14) Ventilated shields for side
trim must extend the full length
of the trim.
An unprotected mantel ("A", Figure 15) cannot be more than
9" (230 mm) deep and must have a minimum clearance of
41" (1041 mm), measured from the stove's top plate. With
a ventilated shield, this clearance may be reduced safely to
29" (737 mm).
Unprotected top trim (B) protruding 3/4" (19 mm) or less from
the face of the fireplace must be a minimum of 28" (711 mm)
from the stove's top surface. With a ventilated trim shield, this
clearance may be reduced safely to 21" (533 mm).
Screen
Shield
Metal Spacer
1" (25mm)
1/4" (6mm)
Figure 14 - A custom-
formed mantel shield.
ST501
mantel and
trim shield
11/10/00 djt
3-90-30005220