The AMG Eagle Extreme (this industry-wide top performer is unmatched with suction and airflow) is only available in white and fits 3” Fernco Couplers (also available for purchase—see couplers below). We recommend this fan for moderate-sized homes or structures between 500-2000 sq. ft. built upon compact or moist sub-slabs such as clay with multiple suction points and/or double stacking.