Table of Contents
Advertisement
Chase Framing
¥
The chase framing must be framed to the minimum dimensions shown in the illustration below.
+ The shaded framing in the illustration below be framed in after the fireplace is installed to ease
chimney installation. If this framing must be installed prior to the fireplace installation be sure to
account for the hearth height (if greater than 11") before determining the header height. It must be a
minimum of 17 1/2" above the masonry enclosure. Consider installing the fireplace and masonry in
the desired location and then constructing the framing around it to the proper clearances.
+ To determine the depth of the chase, facing depth and type of masonry enclosure must be
determined. The ideal chase depth for a tile face is 28 1/2". For brick it is 26 1/2". When
determining the depth, apply all of the minimum clearances. Check all of the specifications and
make a detailed sketch outlining all the dimensions for this construction before beginning. If the
chase does not work out to be the desired depth based on the facing material, additional framing may
be added to the front of the existing framing to shim the facing to the needed location.
¥
The chase must be vented with a minimum 28 square inch of cross sectional opening duct (use the
included 6" diameter air vent). Failure to vent the system will create a fire hazard. This vent
circulates air into the space between the chase and the masonry enclosure and provides cooling air
for the double-wall chimney. The vent must terminate within 24" of the chase floor (see illustration
below). The maximum length for 6" diameter round duct is 12' and 25' for 8" duct. The duct can go
to an attic or crawl space providing they are vented. Some building codes may require that the ducts
continue through the attic or crawl space to an outside wall.
Block
Enclosure
? Check with the local building department if venting anyplace other than outdoors. This includes the
attic, crawl space, or garage. This type of venting may require a special type of venting duct such as
a venting duct with a fire curtain.
+ This vent should be installed before starting the block-in procedure to allow for the space needed to
measure and cut the hole for the duct.
B
-I
I
LOCK
N
NSTALLATION
It is suggested that this portion is
framed after masonry is completed.
Must be above the
mantle and a
minimum of 17 1/2"
above the masonry
block-in.
63" Min.
46" Min., 48" Suggested
(C
ONTINUED
Chase Wall
Cooling Air Vent
24" Maximum
(Measured From
Center of Vent)
)
P
3
AGE
Advertisement
Table of Contents
