Constructing The Appliance Chase - Heatilator CD4236IR-C Owner's Manual

B. Constructing the Appliance Chase
A chase is a vertical box-like structure built to enclose the
gas appliance and/or its vent system. In cooler climates
the vent should be enclosed inside the chase.
NOTICE: Treatment of ceiling fi restops and wall shield
fi restops and construction of the chase may vary with the
type of building. These instructions are not substitutes
for the requirements of local building codes. Therefore,
you MUST check local building codes to determine the
requirements to these steps.
Chases should be constructed in the manner of all out-
side walls of the home to prevent cold air drafting prob-
lems. The chase should not break the outside building
envelope in any manner.

D
Models
CD4236 Series
CD4842 Series
* Adjust framing dimensions for interior sheathing (such as sheetrock)
C** Add 12 inches for rear venting with one 90º elbow.
Figure 5.2 Clearances to Combustibles
COMBUSTIBLE FLOORING MAY BE INSTALLED
NEXT TO THE FRONT OF THE APPLIANCE.
A
B
C
*
MINIMUM FRAMING DIMENSIONS
A B
Rough Rough Rough
Opening Opening Opening
(Width) (Height) (Depth)
in. 10 40-1/8
mm 254 1019 559
in. 10 42-1/8
mm 254 1019 559
Heatilator • CD4236IR-C, CD4842IR-C • 2207-900 Rev. G • 8/10
Walls, ceiling, base plate and cantilever fl oor of the chase
should be insulated. Vapor and air infi ltration barriers
should be installed in the chase as per regional codes for
the rest of the home. Additionally, in regions where cold
air infi ltration may be an issue, the inside surfaces may be
sheetrocked and taped for maximum air tightness.
To further prevent drafts, the wall shield and ceiling fi re-
stops should be caulked with caulk with a minimum of
300º continuous exposure rating to seal gaps. Gas line
holes and other openings should be caulked with caulk with
a minimum of 300º continuous exposure rating or stuffed
with unfaced insulation. If the appliance is being installed
on a cement surface, a layer of plywood may be placed
underneath to prevent conducting cold up into the room.
F
C** D E
Rough
Clearance Combustible
Opening
to Ceiling Floor
(Width)
22 42 25
1067 635
22 49 25
1245 635
J
I
G
F G H
Combustible Behind Sides of
Flooring Appliance Appliance
0 0 1/2
0 0 13
0 0 1/2
0 0 13

E
H
I J
Front of
Appliance
1/2 36
13 914
1/2 36
13 914
21