Odor Dilution: Theory & Practical Solutions
In some applications, the problem isn't with sewage gas leaking out of
the venting system into living areas - It's with sewage gas entering
living areas after leaving the outdoor vent pipe.
Here's an example: The outlet for a roof-mounted sewer vent pipe is
located less than 10 feet away from a patio frequently occupied by
guests. Prevailing winds and the shape of the building occasionally
funnel sewage odors down into the patio area.
In this case, even though the venting system is working as designed,
it's not consistently moving the odors to an area where they won't be
objectionable.
One solution to this problem is odor
dilution - i.e., diluting the odors with fresh air before
they can reach living areas.
Typically, this is accomplished by installing an odor dilution air injector
below a sewer vent fan, so that the fan not only draws odors out of the
vent system, but also mixes it with much larger amounts of fresh air in
the injector:

Results:
1. Much lower concentration of sewer gas in the air exiting the vent
system, and
2. Much higher air velocity as it leaves the vent system, when tends to
keep it from sinking down into living areas.
Note that the air injector must be installed in an outdoor area - This
ensures that there is no chance of it venting sewage gas into living
spaces if the vent fan ever stops working. Typically, it's installed
immediately below the vent fan, although it could be located at just
about any other point on the suction side of the fan that has fresh
outdoor air available.

Our Air
Injector includes one 4" rubber drain coupler, which is typically used
to mate it with a vent fan (sold separately). The two rubber drain
couplers supplied with the vent fan are then used to install the
fan/injector combination to your vent pipe.
Since it's installed outdoors, it's typically used with the Weatherproof
Outdoor version of our vent fan.
Here's a typical example of an Air Injector/Vent Fan combo, using the
2" rubber reducing couplers ordered with that particular fan:

Note that the Air
Injector is ALWAYS
mounted on the air INLET
(bottom) side of the vent fan.

PRICES & ORDERING:
CLICK
HERE to order an Odor Dilution
Air Injector and a Super Stanker Weatherproof Outdoor Fan with 1.5"
rubber drain couplers for $284.25*.
CLICK
HERE to order an Odor Dilution
Air Injector and a Super Stanker Weatherproof Outdoor Fan with 2"
rubber drain couplers for $284.25*.
CLICK HERE to
order an Odor Dilution Air
Injector and a Super Stanker Weatherproof Outdoor Fan with 3" rubber
drain couplers for $284.25*.
CLICK HERE to
order an Odor Dilution Air
Injector and a Super Stanker Weatherproof Outdoor Fan with 4" rubber
drain couplers for $284.25*.
CLICK HERE to
order an Odor Dilution Air
Injector by itself for $47.25* (includes one 4" rubber drain
coupler).
*Plus $13.60 USPS Priority Mail
shipping to any US destination.
Last Updated 2/7/2020