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