Kalōk joñan kōto eo ej etal ilo kein kōto eo
F - Air duct cross-sectional shape. Rectangular ak round.
D - Duct diameter.
X - Depakpak in duct eo ej āinwōt rectangular.
Y - Utiej in juon duct eo ej āinwōt rectangular.
E - Mōkaj in kōto, ilo juon sekoņ.
maroñ ko an būrookraam eo.
Kalōk joñan kōto eo ej etal ilo jikin kōto eo.