PPO Positive Pressure Open Style Dust Collectors

The solution for NFPA indoor woodworking dust collectors

Although the preferred location for a dust collector is outdoors for fire and explosion safety, there are times when the dust collector must be located indoors. When an enclosed dust collector for wood dust is 1500 CFM or greater and installed indoors, the enclosure must have an explosion vent ducted with a short duct to the outdoors, per NFPA 664. If there is no exterior wall, then it is not possible to duct the explosion vent. In these situations, the PPO should be considered, since it is enclosure less & does not require explosion venting. Follow the NFPA requirements for enclosureless dust collectors.

Sizes

Sternvent offers 5 sizes, 1,500-5,000 cfm, of PPO dust collectors. Filters are 11” diameter polyester felt. The fan has a material handling impeller and is belt drive low speed radial design.

Principle of Operation

The dirty air stream enters the fan inlet and is blown into the plenum horizontally. Heavy particles go down into the clear plastic storage bags. The bottom of the filters is open and attached to the plenum. The top of the filters are closed and hang from the support. The air & fine dust go inside of the filter bags. The air passes through the filter media, while the dust forms a dust mat on the inside surface of the filters. When the fan is off, the filters relax and loose dust falls into the plastic bags.