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8390-975
Vermont Castings • Defiant® Model 1975-CAT-C Installation Manual_R8 • 02/21
G. Clearance to Combustibles
Keep the Stove a Safe Distance From Surrounding
Materials
Both a stove and its chimney connector radiate heat in all
directions when operating, and nearby combustible materials
can overheat dangerously if they are too close to the heat
source. A safe installation requires that adequate clearance
be maintained between the hot stove and its connector and
nearby combustibles.
Clearance is the distance between either your stove or
chimney connector, and nearby walls, floors, the ceiling,
and any other fixed combustible surface. This appliance has
specific clearance requirements that have been established
after careful research and testing. These clearance
requirements must be strictly observed.
In addition, keep furnishings and other combustible materials
away from the stove. In general, a distance of 48" (1219
mm) must be maintained between the stove and movable
combustible items such as drying clothes, furniture,
newspapers, firewood, etc. Keeping those clearance areas
empty assures that nearby surfaces and objects will not
overheat.
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 this appliance is installed using 6"
connector pipe parallel to the rear wall and no connector
shield is used, it must be at least 15" (381 mm) from the
wall behind it and at least 19" (483 mm) from walls on either
side. These dimensions are measured from the back of the
rear shroud and the side edge of the cast iron top to the
combustible wall.
If this appliance 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 the clearance chart for approved
clearance reduction specifications.
NOTE: Installation of this appliance is not permitted in
alcoves.
ST248
wall shield construction
12/14/99 djt
Stud Wall
Framing
Wall Shield
Noncombustible
Spacers and
Fasteners
Drywall
Air Flow
Air Flow
Screen
Shield
Metal
Spacer
Figure 2.11
- Approved wall shield construction.
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.
Fireplace and Mantel Trim Shields
A fireplace installation requires special clearance between
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.
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
®
, or common brick
“laid on flat,” with the 3-1/2" (90 mm) side down.
Shields must be spaced out from the combustible surface 1"
(25 mm) on noncombustible spacers, as in Figure 2.11. 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 2.11.
