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Attic fan location with roof flashing
Backer rod and sealed floor crack
Basement dirt floor covered with EPDM membrane
Diagram of simple Sub-slab Depressurization System
Exterior exhaust pipe routed through soffit
Exterior fan and exhaust pipe
Filling perimeter joint with backer rod
Firestop device installed
Outside fan and exhaust pipe around soffit
Radiation from Building Materials
Sealed Perimeter
Sealing the perimeter joint
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