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If the attic space is ventilated and the fireplace system
height from floor to the flue outlet of the termination is 13'6''
or more, it is not necessary to use the Thimble and extend
the radiation shield into the roof flashing. The installation
can be done as a normal residential installation using the
standard firestop attic shield.
E. Install Ceiling Firestops
CAUTION! Risk of Fire! Ceiling firestops must be used
whenever the chimney penetrates a ceiling/floor.
• The ceiling firestop slows spread of fire and reduces
cold air infiltration.
•
Install a ceiling firestop whenever chimney penetrates
ceiling/floor.
•
Mark and cut an opening in ceiling as shown in Figure 5.7.
•
Frame the opening with the same size lumber used in
the ceiling joists.
•
Nail the ceiling firestop to the bottom of the ceiling joists
when there is a room above.
•
Use an attic insulation shield if the ceiling is insulated.
The ceiling firestop may then be attached above or below
the joists.
ROOM ABOVE (non-insulated ceiling)
B
Ceilng firestop
attached to bottom
of framing
ATTIC ABOVE (insulated ceiling)
Ceiling firestop
attached to top of
framing
2 in. (51mm)
clearance
Note:
Use same dimensional lumber for framing
ceiling firestop and joists.
Catalog #
in.
FS338
14-1/2
FS339
14-1/2
FS340
14-1/2
Figure 5.7
Installing the Ceiling Firestop
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
A
2 in. (51mm)
clearance
A
B
mm
in.
mm
368
14-1/2
368
368
18-3/8
467
368
23
584
WARNING! Risk of Fire! DO NOT seal area between
firestop opening and chimney pipe except where they en-
ter the attic or leave the warm air envelope of the home
(use 600° F sealant).
F. Attic Insulation Shield Installation
WARNING! Risk of Fire! You MUST install an attic insu-
lation shield when there is any possibility of insulation or
other combustible material coming into contact with the
chimney.
ThIMbLE AppLICATION NOT REqUIRED WhEN ATTIC
INsULATION shIELD Is UsED.
• DO NOT pack insulation between the chimney and the
attic insulation shield.
• Failure to keep insulation and other materials away from
chimney pipe could cause fire.
• DO NOT offset chimney inside insulation shield.
Installation of a ceiling firestop is required:
•
Refer to Figures 5.7, 5.9, 5.10.
•
Roll the shield (around the chimney if already installed).
The three holes on each side will match up (large holes
on top).
•
Insert three screws into the matching holes to form a
tube.
•
Bend the tabs on the bottom of the tube inward to 90° to
maintain chimney air space.
•
Rest the insulation shield on the ceiling firestop below.
•
Bend the tabs at the top of the shield inward to 90° to
maintain the 2 in. (51 mm) air space from the chimney.
17
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