Forced-fluid switch

A method of exchanging heat with a forced-fluid process chamber, comprising:

• forcing a fluid flow having a direction through a fluid path around the forced-fluid process chamber using a blower having a force;
• reversing the direction of the fluid flow by simultaneously switching a first switch including a first spherical stopper and a second switch including a second spherical stopper by moving the first spherical stopper from blocking a first passage from a first plenum to a fourth plenum to blocking a second passage from the first plenum to a third plenum, and by moving the second spherical stopper from blocking a third passage from a second plenum to the third plenum to blocking a fourth passage from the second plenum to the fourth plenum;
• maintaining the force of the blower during the reversing;
• and
• wherein the first plenum is in communication with the blower and the second plenum is in communication with a vacuum configured to suck the forced fluid, and the third plenum and the fourth plenum are in communication with the fluid path around forced-fluid process chamber, and in the direction of the fluid flow the forced fluid travels from the first plenum to the third plenum and from the third plenum through the forced-fluid process chamber to the fourth plenum and from the fourth plenum to the second plenum, and in the reversed direction of the fluid flow path the forced fluid travels from the first plenum to the fourth plenum and from the fourth plenum through the forced-fluid process chamber to the third plenum and from the third plenum to the second plenum.