Fire Rated Exhaust Fan Enclosure: The only listed and labeled solution for exhaust fans in bathrooms and other areas, providing a one hour fire rating while also maintaining CFM specifications. The inside clearance for exhaust devices is 11.80" Wide x 19.80" Long x 9.12" Deep. This one hour rated exhaust fan enclosure can be used with all major brands including, but not limited to Delta, Panasonic, Broan, Nutone, and Air King. The FN-Z-12-20-9-EXH also accommodates ductwork diameters ranging from 4" to 6". 
 
 
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