def METHOD_NAME(self):
    # Build membrane channel control volume
    self.feed_side = MembraneChannel0DBlock(
        dynamic=False,
        has_holdup=False,
        property_package=self.config.property_package,
        property_package_args=self.config.property_package_args,
    )
    if (self.config.pressure_change_type != PressureChangeType.fixed_per_stage) or (
        self.config.mass_transfer_coefficient == MassTransferCoefficient.calculated
    ):
        self._add_length_and_width()
        self.feed_side.add_geometry(length_var=self.length, width_var=self.width)
        self._add_area(include_constraint=True)
    else:
        self.feed_side.add_geometry(length_var=None, width_var=None)
        self._add_area(include_constraint=False)