Infiltrator Presby Advanced Enviro-Septic Design And Installation Manual page 15

2.0 SYSTEM DESIGN
Vent Manifolds
A vent manifold may be incorporated to connect the ends of a number of
sections or rows of AES pipe to a single vent opening. Slope the lines
connecting the manifold to the AES pipes to drain condensation.
Gravity Systems Vent Location
•
A vent manifold shall be used to connect the distal ends of the rows within a bed (or each section in a
multiple bed system).
•
The vent manifold shall include use of offset adapters.
•
A low vent shall be installed into any aspect of the vent manifold of the bed (or each section in a multiple
bed system).
•
The house (roof) vent functions as the high vent as long as there are no restrictions or other vents
between the low vent and the house (roof) vent.
•
When the house (roof) vent functions as the high vent, there shall be a minimum of a 10 ft vertical
differential between the low and high (roof) vent openings.
Illustration of gravity system air flow:
ROOF VENT (HIGH VENT,
EXHAUST - CREATES SUCTION)
VENTING IS ESTABLISHED THROUGH SUCTION (CHIMNEY EFFECT) CREATED BY THE DRAW OF AIR
FROM THE HIGH VENT, WHICH DRAWS AIR INTO THE LOW VENT AT THE LEACH FIELD THEN
THROUGH THE SEPTIC TANK AND EXHAUSTED THROUGH THE (HIGH) ROOF VENT.
© Presby Environmental, Inc., Design & Installation Manual, September 2020 Edition
GRAVITY SYSTEM AIR FLOW
NOTES:
1. EFFLUENT FILTER (IF USED) MUST BE PROPERLY
MAINTAINED TO ENSURE ADEQUATE AIR FLOW.
2. DO NOT USE CHARCOAL FILTERS ON VENTS. THEY
CAN RESTRICT AIR FLOW.
PVC SANITARY TEE
INLET BAFFLE
WITH OPEN TOP
LOW VENT
(AIR INLET)
PVC SANITARY TEE OUTLET
BAFFLE WITH OPEN TOP
PVC BAFFLE
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