FAN FAQ TOPICS:

Best seller Fan ID - serial numbers Carbon Monoxide / CO Levels Electric fans and GFCI Exhaust extensions Honda GC versus GX motors Negative pressure ventilation (versus PPV) Fan lifespan and durability Fan stability and walking Safety Light option Noise levels

Propeller composition and blades Wood versus metal propellers Wheels - Pneumatic, Solid Fan placement Horsepower and size Confined space ventilation Shrouds Troubleshooting Thrust Warning

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 produced during combustion better than less efficient fans. 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). VENTRY Fans do not have problems of high CO/carbon monoxide levels that other fans do when proper ventilation techniques are used.

If you have levels high enough that you are considering exhaust extensions, consider getting a better fan instead!

OSHA standards prohibit worker exposure to more than 50 parts of carbon monoxide gas per million parts (ppm). Source: OSHA Carbon Monoxide Fact Sheet from osha.gov, retrived July 29, 2010. Click here to open the fact sheet, on the OSHA site, in a new window. CO levels on all VENTRY Fan models are well below this level.

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.

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 an electric fan and 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. Electric fans emit zero carbon monoxide.

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