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W415-0616 / B / 02.18.08
16
MINIMUM INSIDE VERTICAL CLEARANCES
Outside air (Recommended)
(Installation showing inlet of out-
side air in ventilated crawl space)
Ceiling Support
Vent must maintain 3”
clearance to combus-
tibles.
Vertical Cap
Roof Flashing
Storm Collar
Floor Protection
3”
2”
Class A Chimney
Ceiling Support
Outside air (Recommended)
(Installation showing inlet of out-
side air in ventilated crawl space)
Vent must maintain 3”
clearance to combus-
tibles.
Roof Flashing
Storm Collar
Floor Protection
3”
2”
Vertical Cap
CLASS A CHIMNEY RETROFIT
Figure 15
Figure 16