Hidden exhaust fan Nasco with 90 suction power, size 20*20

Ceiling exhaust fan, hidden, steel body, powerful suction 90 CFM, gypsum opening size 17*17, 4-inch outlet, very quiet efficiency, (very quiet), immediate replacement warranty (5 years), country of origin: China - You can order accessories here: flexible hose (Hanjur) 4-inch size, ventilation opening protection from birds and insects: circular grill with 4-inch and 6-inch sizes, available with 2 suction powers (90 - 150). A 2x1.5 bathroom needs a fan with 90 power (4-inch outlet). A 2.5x2 bathroom needs a fan with 150 power (4-inch outlet).