What types of hoods can be used with a portable weld fume collector?

A portable weld fume extractor is attached to some type of hood or collection device. 

• Fume guns, or extraction torches, are a natural companion to a high-vacuum portable extractor. These devices integrate fume extraction into the torch itself. A MIG fume gun with a portable hi-vac extractor enables a high degree of welder mobility for working on large weldments. The ProCube II portable hi-vac extractor can handle up to two welders using fume guns. 
• Fume extraction arms can be attached directly to the extraction unit. The fume arm is positioned over the weld seam to collect fumes. Fume extraction arms are usually articulated to enable easy positioning.
• Some portable fume extractors use a simple flex hose with a cone for fume collection. The cone is simply laid near the fume source. However, the flex hose does not hold the intake in place like a fume arm.  
• A small portable dust collector may also be ducted to a small extraction hood or backdraft plenum. For manual welding, the plenum must be positioned behind the welding surface to pull weld fumes up and away from the breathing zone.