USSC Hotblast 1357M Owner's Manual page 11

FIGURE 12, PART A
MINIMUM 12 IN.
TO COMBUSTIBLES
1. Use a minimum 3-1/2" thick brick masonry wall framed into the combustible wall. A fireclay liner (ASTM C315 or equivalent) having
a 5/8" minimum wall thickness must be used and it must be at least 12" away from any material that could catch fire. The inside
diameter of the fireclay liner shall be sized for the proper snug fit of a 6" diameter chimney connector pipe. The fireclay liner shall
run from the outer surface of the brick wall to, but not beyond, the inner surface of the chimney flue and shall be firmly cemented
in place. See Part A.
FIGURE 12, PART B
2. Use a solid insulated listed factory-built chimney length having an inside diameter of 6" and having 1" or more of solid insulation.
There must be at least a 9" air space between the outer wall of the chimney length and any combustible materials. The inner end
of the chimney length shall be flush with the inside of the masonry chimney flue and shall be sealed to the flue and to the brick ma-
sonry penetration with nonwater-soluble refractory cement. Sheet steel supports which are at least 24 gauge (0.024") in thickness
shall be securely fastened to wall surfaces on all sides. Fasteners between supports and the chimney length shall not penetrate
the chimney liner. See Part B.
FIGURE 12, PART C
3. Use a 10" diameter ventilated thimble made of at least 24 gauge (0.024") steel having two 1" air channels. The ventilated thimble
must be separated from combustible materials by a minimum of 6" glass fiber insulation. The opening in the combustible wall shall
be covered and the thimble supported with sheet steel supports which are at least 24 gauge (0.024") in thickness. The sheet steel
supports shall be securely fastened to wall surfaces on all sides and shall be sized to fit and hold the chimney section. Fasteners
used to secure chimney sections shall not penetrate chimney flue liner. See Part C.
FACTORY-BUILT
CHIMNEY LENGTH
AIR SPACE
9 IN. MINIMUM
TWO VENTILATED AIR
CHANNELS EACH 1 INCH.
CONSTRUCTED OF
SHEET STEEL.
MASONRY CHIMNEY
CONSTRUCTED TO
NFPA 211
MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO
SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.
NONSOLUBLE
REFACTORY
CEMENT
CHIMNEY LENGTH
FLUSH WITH INSIDE
OF FLUE
MASONRY CHIMNEY CONSTRUCTED
TO NFPA 211
MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO
SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.
CHIMNEY THIMBLE
MASONRY CHIMNEY CONSTRUCTED
TO NFPA 211
11
MINIMUM CHIMNEY CLEARANCE TO
BRICK AND COMBUSTIBLES IS 2 IN.
MINIMUM CLEARANCES 12 IN.
OF BRICK ALL AROUND
CHIMNEY CONNECTOR
TO HEATER
FIRE CLAY LINER
(5/8" MIN. WALL THICKNESS)
MIN. 3-1/2" THICK BRICK
MASONRY WALL
MINIMUM CLEARANCE
9 IN. ALL AROUND
CHIMNEY CONNECTOR
TO HEATER
USE CHIMNEY MFRS. PARTS TO
ATTACH CONNECTOR SECURELY
SOLID INSULATED, LISTED
FACTORY-BUILT CHIMNEY LENGTH
SHEET STEEL SUPPORTS
(24 GAUGE MIN. THICKNESS)
24 GAUGE
VENTILATED THIMBLE WITH
TWO 1 INCH AIR CHANNELS
CHIMNEY CONNECTOR
TO HEATER
MINIMUM 6 IN. GLASS
FIBER INSULATION ALL AROUND
SHEET STEEL SUPPORTS
(24 GAUGE MIN. THICKNESS)