New Buck Corporation 91 B02F10B82B3D331079A9C page 19

Ceiling Exit - Close Clearance
1. Suspend a plumb bob from ceiling above unit so
that weight is hanging in the center of flue exit.
(A small weight on a string will serve as a plumb
bob.) Mark ceiling where string is suspended to
locate center of chimney hole.
2. After locating center of hole, install ceiling
support box, chimney, flashing and rain cap.
3. Install Double Wall Connector and chimney
system per manufacturer's written operating
instructions. See manufacturer's list of tested
pipes. See example of installation Figure 17.
CAUTION: Because of the high efficiency and
low flue gas temperature, freestanding catalytic
heaters connected to masonry chimneys with
oversized flue liners may encounter drafting problems
A positive flue liner (optional) may be necessary to
help draft. A poor drafting chimney may result in poor
performance from Model 91. This is not a defect of
the Model 91 but a defect in the chimney. This is not a
warranty problem with the Model 91. Contact dealer
for possible solutions for chimney.
Example: The rear clearance for the Model 91 from page 15 is 14". (See Figure 13.) This clearance may be
reduced by 50% to 9" by using either of the wall protection devices mentioned below Figure 18.
ALTERNATIVES FOR WALL PROTECTION
BRICK CLEAR-
ANCE REDUC-
TION SYSTEM
BRICK WALL
SPACED OUT I
INCH FROM
PROTECTED
SURFACE
FLOOR
LEAVE I INCH
CLEARANCE FOR
AIR CIRCULATION
BRICK WALLS MAY BE ATTACHED TO COMBUSTIBLE WALLS USING WALL TIES
IF BRICK IS USED. BE SURE FLOOR CAN WITHSTAND WEIGHT OF BRICK.
COMBUSTIBLE WALL
CLEARANCE REDUC-
TION STEM SPACED
WOOD STOVE
OUT 1 INCH
AIR CIRCULATION
COMBUSTIBLE WALL
FIGURE 18
Page 17
Page 18
FIGURE 17
COMBUSTIBLE WALL
1 INCH NON-COMBUSTIBLE SPACER SUCH AS
STACKED WASHERS, SMALL DIAMETER PIPE, TUBING
OR ELECTRICAL CONDUIT.
DO NOT USE FASTENERS DIRECTLY BEHIND CHIMNEY
CONNECTOR OR STOVE.
MINIMUM 24 GAUGE
SHEET METAL
FLOOR PROTECTOR
CEILING
SUPPORT BOX
SINGLE WALL
PIPE
OPTIONAL NBC
CAST CHIMNEY
CONNECTOR
(COLLAR)
AIR SPACE
1"
NAIL OR
SCREW
ANCHOR
MINIMUM
24 GAUGE
SHEET
METAL
TOP VIEW
NON-COMBUSTIBLE
SPACERS