Disclosed is a fan housing assembly 110 suitable to be mounted on a building, which includes; a housing 112 with a fan mounting arrangement, a base portion 116 at a first end which can connect to a building, and a tubular portion 118 extending from the base portion, where a free end 120 of the tubular portion defines a second end of the housing, with the housing defining an airflow path from the first to the second end; a diffuser 138 positioned outside of the housing with a narrow end proximate the housing and a wider end away from the housing; a cowl 128 positioned to cover the second end of the diffuser with a gap between. The cowl may be continuously curved and circular in shape. The outer perimeter of the cowl may be co-planar with the second end of the diffuser. Also included is a method of manufacture of the fan housing assembly.
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