Tuubooyinka dhuumaha ee kala duwan ayaa loo isticmaalaa xaalado kala duwan, sidaas darteedna way ku kala duwan yihiin isticmaalkooda inta u dhaxaysa -inlet, high-outlet, high-inlet, low-mambooyin soo bixista.
Hoosudhaca -, ee sare {{1}matoorada ka soo baxa ayaa ku haboon in laga soo qaado dareeraha meel hoose ilaa meel sare, kana fog goobta asalka ah. Dhanka kale, bambooyin sare - gudaha, hoose -kuwa ku haboon in laga soo qaado dareeraha meel sare, ka fog goobta asalka ah, meel hoose.