14
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
5
Chimney Installation
A. Typical Chimney System
(roof)
(insulation)
Mobile Home
Thimble
(ceiling)
(attic)
Storm Collar
Roof Flashing
Must have 2 in. (51 mm)
minimum clearance
to header
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Thimble Extension
Chimney must extend
beyond combustible
roof structure
Maintain minimum
height of chimney
above roof
Additional
support for
tall chimneys
Install roof flashing
according to minimum
requirements
Maintain minimum
clearances to
combustibles as
specified
Offsets/returns
may not exceed
30° from vertical
Lock chimney
sections together
firmly to resist
movement
Ceiling firestops
are required where
chimney passes
through ceiling or
floor
Support straps for offsets
(not shown) must be
secured to adequate framing
Termination Cap
Storm Collar
Offsets/returns must be
secured with the screws
provided (outer pipe only)
Attic shield
Figure 5.1 Typical Chimney System - Thimble Application
Figure 5.2 Typical Chimney System - Attic Shield Application