An air passage openclose device includes a casing having an air passage, and a sliding door having a board member slidably located in the casing so as to open or close the air passage. The sorbent contains 1% to 50% by weight wood particles and 50% to 99% by weight ground grain. The enclosure includes a moveable front panel that pivots to flip between a closed position and an open position. An error signal generator generates an error signal by normalizing the difference between first and second sums obtained from the first and second accumulative adders, respectively, by means of the sum total of the first and second sums. A calculator module may be coupled to the monitor module, the calculator module calculating a calibrated parameter for the adaptive-rate pacing device based on the intrinsic chronotropic response.