less than 2.5 psi cabin differential,
yes FD ,you got it right.Why do you think it's not the answer?
And B7356.. the airflow at less than 290 kts will probably not be enaugh to create the necessary low pressure.That's what the QRH says. The recirc fan has no influence here,just look at a diagram of the fan airflow design,it just recirculates air,as it's name says.So hot air,even hotter.