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FAN FAQ TOPICS:
Why do VENTRY Fans have lower CO levels than other PPV Fans?
VENTRY Fans simply push more air with less horsepower than other brands so dilute the CO much better. This efficiency means VENTRY Fans do not have problems of high CO/carbon monoxide levels that the other fans do when proper ventilation techniques are used.
We use the same Honda engines as the other guys, but our props utilize that horsepower better, producing more air volume with less engine power. Getting bigger air volumes using smaller engines means VENTRY Fans produce less carbon monoxide to begin with. This is especially important if you use a PPV Fan for fire fighter rehab. At low rpms, poor propeller designs stir the air instead of pushing it, spewing high levels of toxic carbon monoxide all over your fire fighters!
Additionally, the greater air volume of VENTRY Fans also dilutes the exhaust more than the competition, resulting in less CO at equilibrium. CO does not accumulate if the air is flowing well (you must have an adequate exit for the air flow as well as sufficient input).
To realize these efficiencies, VENTRY fans combine several features. First, the tripod leg design allows you to raise the fan off the ground, allowing more air to get to the propeller. Without legs, box fans sit on the ground, and the bottom portion of the prop is partially starved of air. (Always extend the legs on your VENTRY Fan, even if only 6 inches, to prevent the prop starvation situation of leg-less and shrouded fans.)
Second, our propeller design is based on the same technology as aircraft propellers. We produce much more thrust using much less horsepower than traditional fan blades. Recall physics and Newton's Third Law of Motion: for every action there is an equal and opposite reaction. The more thrust we produce (ie the harder the fan is pushing) the more air we are moving (pushing). Our fan blades push the air instead of beating it up! By the way, in addition to reduced CO levels, the ability of VENTRY Fans to produce more air from less engine power also results in less noise, less weight, and less expense! Together, these features create a very versatile fan with many advantages over ground hugger fans with conventional propellers.
Please note: When using PPV Fans for cleanup and overhaul, it is recommended to use negative pressure. Turn your VENTRY Fan around and let it suck 100% fresh air through the structure and blow the exhaust away.
For those interested in extremely low CO levels, we also offer a propane powered fan. With propane-powered VENTRY Fans, you need an extremely sensitive, very accurate meter to detect CO at all! Theoretical CO levels are less than 0.5 PPM.
