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NOTE: DO NOT BLOCK ANY EXISTING LOUVERS OR VENT ON EXISTING
PREFAB WITH ANY TRIM PANELS FOR MODEL 18.
NOTE: If Pre-Fab Zero Clearance Fireplace is not equipped
With HT-2100 degree UL Listed pipe, a UL-1777 Liner must be
Installed Full Length of chimney and attached to Flue Exit of
Insert.
NOTE: If Pre-Fab Zero Clearance Fireplace is equipped with HT-
2100 degree UL Listed pipe, one of the two following methods must
be met:
HEATER INSTALLATION
A. There are two listed and tested methods of installation of the Model 18 heater into a zero-
clearance or pre-fab fireplace.
1. 6" Increaser
a. The preferred method is to use an increaser made of 24 gauge (minimum) stainless
steel to go from 6" inside diameter to exact diameter of fireplace throat/chimney.
See Page 14, Figure A.
b. Position increaser into throat/chimney of Zero-Clearance Cabinet at a height
slightly higher than Model 18 will be after installation. NOTE: The increaser
may be a two part slip connector type, if desired.
2. Ceramic Blanket
a. The second method is to use a 6" stainless steel connector (rigid or flex) and a
ceramic blanket (available from your dealer). (See Page 14, Figure B).
b. Cut connector at least 18" long and tightly wrap upper portion of connector with
ceramic blanket to almost t size of fireplace throat/chimney.
c. Insert connector into fireplace throat/chimney and use additional ceramic
insulation and tightly pack around connector and throat/chimney at a height
slightly higher than Model 18 will be after installation. NOTE: The increaser
may be a two part size connector type if desired.
Page 13
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