Hotblast 1357M, Owner'S Manual

11

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 

MINIMUM 12 IN.

TO COMBUSTIBLES

FIGURE 12, PART A

CHIMNEY

 FLU

E

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

MASONRY CHIMNEY

CONSTRUCTED TO

NFPA 211

FIGURE 12, PART B

AIR SPACE

9 IN. MINIMUM

FACTORY-BUILT

CHIMNEY LENGTH

MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO

SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.

CHIMNEY LENGTH

FLUSH WITH INSIDE

OF FLUE

NONSOLUBLE

REFACTORY

CEMENT

MASONRY CHIMNEY CONSTRUCTED

TO NFPA 211

CHIMNEY CONNECTOR

TO HEATER

MINIMUM CLEARANCE

9 IN.  ALL AROUND

SHEET STEEL SUPPORTS

(24 GAUGE MIN. THICKNESS)

CHIMNEY

 FLUE

SOLID INSULATED, LISTED

FACTORY-BUILT CHIMNEY LENGTH

USE CHIMNEY MFRS. PARTS TO

ATTACH CONNECTOR SECURELY

AIR SPACE

inner surface of the chimney flue and shall be firmly cemented in place. See Part A.

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 masonry penetration with nonwater-soluble refractory cement. Sheet steel supports 

TWO VENTILATED AIR

CHANNELS EACH 1 INCH.

CONSTRUCTED OF

SHEET STEEL.

FIGURE 12, PART C

MASONRY CHIMNEY CONSTRUCTED

TO NFPA 211

SHEET STEEL SUPPORTS

(24 GAUGE MIN. THICKNESS)

MINIMUM CHIMNEY CLEARANCES FROM MASONRY TO

SHEET STEEL SUPPORTS AND COMBUSTIBLES 2 IN.

MINIMUM 6 IN. GLASS

FIBER INSULATION ALL AROUND

24 GAUGE

VENTILATED THIMBLE WITH

TWO 1 INCH AIR CHANNELS

CHIMNEY THIMBLE

CHIMNEY

 FLUE

CHIMNEY CONNECTOR

TO HEATER

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.

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