Performance certified is for installation type D - Ducted Inlet
Ducted outlet. Performance ratings do not include the effects of appurturenances (Accessories)
The sound ratings shown are for loudness values in spherical sones at 5ft. (1.5m) in a spherical free field calculated per Annex B of AMCA 311. Values shown are for installation Type D : Ducted inlet spherical sone levels. Ratings do not include the effect of duct end correction. All sone values shown are calculated at 0.1" Static Pressure in inches W.G.).