An exhaust device for connecting to a personal protective breathing apparatus defining a filtered air volume adjacent to a wearer's face and comprising at least one exhalation, the device comprising at least one exhalation valve and a fluid In communication with the blower, the blower draws a substantial portion of the wearer's exhalation through the at least one exhalation valve in response to the wearer's breathing cycle, and the blower Operates throughout the wearer's exhalation or throughout its substantial duration and does not operate throughout the wearer's inspiration or throughout its substantial duration.着用者の顔面に隣接する濾過空気容量部を画定し、かつ少なくとも１つの呼気を備える、個人保護呼吸器具に接続するための、排気装置であって、この装置は、少なくとも１つの呼気弁と流体連通する、送風機を備え、この送風機は、着用者の呼吸周期に応じて、少なくとも１つの呼気弁を通じて着用者の呼気の実質的な部分を引き出し、着用者の呼吸周期に応じて、この送風機は、着用者の呼息の全体にわたって、又はその実質的な期間の全体にわたって動作し、着用者の吸息の全体にわたって、又はその実質的な期間の全体にわたって動作しない。
