Posi-Ventilation System
(Patent No 7,565,773 B1)
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| At rear of building, fan #1 on top of vertical duct runs continuously. Fan malfunction alarm turns on fan #2. | Air stopped entering front wall lower intake vent and short circuited designed air flow by entering opened back door. Air exits through low level back wall exhaust vent, leaving space unventilated. With Posi-Vent System, air exits building off center line of patented sloped sump trench with doors opened or closed. | Posi-Vent tube is installed a few inches over the patented sloped trench at the low edge of double sloped sump floors. | Posi-Vent tube runs across the middle of the elevated floor grating of the spill containment sump. Attach a duct to flange on sump wall and exhaust heavier than air fumes. |
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| Outside air is drawn into top of box in left photo by internal fan #1 and pushed through Hepa filter and end wall. Photo on right shows duct on inside of same wall. | Left photo has floor grating removed exposing tops of two (one for each sump) Posi-Ventilation tubes. Air enters holes underneath tubes and then is ducted up and out through wall openings. Outside same wall, air is ducted to central duct and exhaust fan #2. This ventilation system removes all heavier-than-air fumes, eliminating need for explosion relief panels. | |
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| Posi-Vent tube just back from the hot dip galvanizer. Typical are 2" diameter evenly spaced holes on bottom of tube and staggered from one side to the other. | Prototype hand operated gate was tested and failed (new design works) in adjusting the opening to provide a means for each hole to pass same volume of air. | Posi-Vent tube
is an integral part of the support steel for the elevated flooring.
Tube is a minimum of 2" above the upper edge of the patented sloped trench welded to lower edge of sloped floor. |
Posi-Ventilation Cross Sectional Views
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| Posi-ventilation system is best. Most ventilation systems attempting to remove heavier-than-air vapors or fumes from the total volume of air in the building. Explosive fumes can begin anywhere in the building as they come off a leaked or spilled chemical liquid. Gravity will eventually pull all heavier-than-air fumes down into the sump floor area. When the sump floor is sloped (u.S. Patent #6,305,131) downward toward a sloped trench (same patent), the liquid can be collected into a smaller exposed surface area reducing the amount of vapor coming off the liquid chemical. By placing a posi-ventilation tube (becomes part of the elevated floor supports) inches over the sloped trench, these fumes can be removed from the building. Graphic "E" (y-axis) shows the posi-vent tube (patent pending) with strategically placed holes on its bottom surface where air and fumes are picked up and directed out of the building wall, up a duct to a continuously running exhaust fan #1 on the roof. Graphic "F" (x-axis) shows a cross section view of same floor of building If fan #1 malfunctions, a flow sensor sounds an alarm and turns on fan #2. Both fans could be on an emergency generator or standby circuit. A posi-ventilation dual exhaust fan system eliminates costly non-fire rated explosion relief panels, fire rated drop down shutters and blast shafts (U.S. Patent #6,223,473B1). |