Abstract: A biohazard centrifuge having an improved air cooling arrangement, wherein a cooling air stream is directed onto and around the rotor chamber of the centrifuge without introducing cooling air thereinto. This results in cooling air being separated from the spinning rotor and reduces the possibility of contamination of the cooling air stream from a leaking sample container. Additionally, further protection to laboratory personnel is afforded by a sealed rotor assembly chamber, and by providing rotor assembly specimen containers or carriers having lids which are easily attached and removed, requiring a simple partial twist to lock the lids into place.