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FAN FAQ TOPICS:

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

Propeller composition and blades Wood versus metal propellers Pneumatic versus solid rubber wheels Fan placement Fan horsepower versus size Confined space ventilation Shrouds Troubleshooting Thrust Warning

Why don’t VENTRY Fans have a shroud?

The outer quarter of a propeller does three quarters of the work. Blocking the air at the tips with a shroud starves the prop of air and dramatically increases noise. To see for yourself, hold your hand flat near the outer edge of a running VENTRY Fan’s free-flow (unshrouded) guard. As you move your hand closer to the prop, the noise level will increase. You will hear a sort of whump-whump-whump sound as the tips pass your hand, because you will be starving the prop of air! If your hand makes that big of a difference, imagine what a 360-degree shroud does!

Fire Chief magazine recently published an article that mentioned shrouds. See our response on the PPA/PPV page.