There are two versions of 360 Siphon™: The Stack Mount fits a pipe opening of 4” Inside Diameter. It also fits to the outside of a 3” pipe (which measures 3.5” outside), and to the outside of a 2” pipe (which measures 2.5” outside). The flanged roof mount version seals to a roof, it has a 3 15/16” flange diameter.
The angle makes no difference to the operation of the 360 Siphon™.
Its aerodynamically engineered, it has no wind resistance; it channels wind into is vortex where it creates a low pressure at the exhaust port. The lid is a complex series of shapes that has taken 3 years of design and field testing.
The 360 Siphon™ cannot fail, it’s the worlds only non-mechanical air check valve that eliminates stack down drafts simultaneously creating a low pressure regardless of wind direction or velocity.
The 360 Siphon™ does two important things to a sewer system. Whenever there is a wind, it is drawing off odors and gasses out of the tank, less chance of fume buildup. It also places a low pressure in the tank when there is a breeze, making it highly unlikely for odors to drift into the cubicle.
If there is no wind there will never be a problem, air pressure differential will not exist, so there is no force pushing the fumes into the cubicle. Not only that, a minimum amount of tank fumes will be present due to earlier winds.
In a perfect situation with a steady moderate wind coming straight in at 90 degrees to the stack, there would be approximately 10% airflow reduction. Unfortunately, gusts and air turbulence is a lot more common, they do nothing but blow air down the stack. Light winds do basically nothing. With the siphon, all these wind conditions are now drawing up gasses, while inhibiting that odor causing down draft. The airflow gain in an everyday situation outweighs the odd chance of the perfect breeze hitting the stack just at right angles.
Assuming maintenance and use is the same, the only remaining variable is venting. An open stack is very vulnerable to wind conditions as previously mentioned. Depending on the physical location of the portable in relation to the wind direction, it could smell worse, (if the wind hits obstacles prior to hitting the stack), or not at all, (if the wind was not obstructed, nor gusty and hit the stack square on). In some cases it might not smell without wind and some cases with wind. The purpose of the 360 Siphon™ is to utilize all these conditions to ensure the least possible chance of odors or fumes.