June 19, 2012 - Suited for contaminated air stream applications, fiberglass FUBV ventilators feature FRP airfoil axial impeller with factory set blade pitch. Fan housing is UV inhibited Hetron 99 P polyester resin, with Class I flame spread of 25 or less.
Source: http://news.thomasnet.com/fullstory/Upblast-Roof-Ventilator-withstands-corrosive-environments-617505
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