Power Roof Ventilator NF-PRV is a low-silhouette, factory assembled package unit constructed to withstand hurricane force winds. Additional information can be found at the Northern Fan company web site http://www.northernindustrialsupplycompany.com/products/air_handling_units.html Oleg Cthetchel Canadian Engineer of Industrial Air Make-Up Units Northern Fan Co. nis@primus.ca http://www.northernindustrialsupplycompany.com/products/heat_exchangers.html http://www.northernindustrialsupplycompany.com/products/humidifiers.html
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