Kuwerengera kuchuluka kwa mpweya ukudutsa mu mpweya wabwino
F - Gawo lofanana ndi duct. Ozungulira kapena ozungulira.
D - M'mimba mwake.
X - The wide of the rectangular duct.
Y - Kutalika kwa rectangular duct.
E - Kuthamanga kwa mpweya, pa sekondi iliyonse.
Mbali.
Kuwerenga kuchuluka kwa mpweya ukudutsa mpweya wabwino.