W415-1472 / 04.21.15
21
EN
4.5.3 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”
4.5.4 CLASS A CHIMNEY RETROFIT
Class A Chimney
Ceiling Support
Outside air
(Recommended)
(Installation show-
ing inlet of outside
air in ventilated
crawl space)
Vent must maintain
3” clearance to
combustibles.
Roof Flashing
Storm Collar
Floor Protection
3”
2”
Vertical Cap
Содержание NPI45
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