Sub-Slab Depressurization
Sub slab depressurization (SSD) - Most homes will
be fixed with a “Sub slab depressurization” system, which uses a fan
and PVC pipe to draw air from below the basement floor and exhausts
it above the roof. The radon fan creates a vacuum under the
basement floor. With the fan running, if you puff smoke by a
crack or opening in the basement floor, you will see the smoke
slowly pulled down through the crack or opening. Turn the fan
off, and the smoke will blow back in your face. As long as the
fan is running, there is literally no underground air entering the
home. Typically, the pipe will run through the garage, and the
fan will be in the garage attic. Other methods consist of the
pipe in a closet and the fan in the attic, or both the pipe and fan
outside.
Arrows indicate the direction of air flow with Active Soil
Depressurization.
The negative pressure field beneath the slab caused by the system
has reversed the normal direction of soil gas flow into the house.
Radon and other soil gases are drawn indoors primarily by the lower
air pressure in the house compared to that of the soil. To
reduce radon-bearing soil gas from entering the house, a small fan
(with associated piping) can be used to withdraw radon directly from
the soil.
We use only the highest quality materials
are used during the installation, assuring many years of
worry free service.
Our lead installation tech has installed hundreds of systems
and is experienced in seeking out options as to where, and
how, to install and rout a system for optimum performance as
well as being aesthetically pleasing.
Below are examples of radon
systems we have installed.
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Exterior mounted fan and exterior PVC pipe painted green
to match gutters and downspouts. |
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Exterior mounted fan painted green to match the gutters
and downspouts. Electrical switch installed and
labeled. |
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Vent pipe emerging from sub-floor with U-tube (system
failure indicator filled with red fluid) and labeling. |
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Fan and exterior pipe painted black to match downspouts
on house.
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Fan and Exterior pipe painted brown to blend in with
house. Notice the labeling on top of pipe. |
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Labeled circuit breaker in panel. |
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Green downspout used for outside vent pipe to match
gutter downspouts. |
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White fan is hidden by bushes and converted to green
downspout used for outside vent pipe. |
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Fan Failure Gauge -U-tube filled with red fluid. |
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Slab suction point in basement. Notice the pipe
and the floor/wall joint is sealed. |
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Slab suction point in basement. Notice the pipe
and the floor/wall joint is sealed. |
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Fan and pipe painted brown to blend in with house. |
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Sub-Membrane installed in crawlspace. Notice pipe
extends on to Sub-slab system. |
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Fan installed on the exterior with labeled electrical
switch. |
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