Fig. 1

Environmental chamber used in this experiment. a Schematic design of the environmental chamber. Air output toward dehumidifier (a), air intake plenum from dehumidifier (b), latches for chamber doors that open longitudinally (c), mobile divider for separating challenge compartment into two sections (d, 1, 2), permanent divider separating challenge from control compartment (e, 3), and gated vent caps for titration of room air (f). b Picture of chamber showing actual materials and dimensions. Schematic design and photograph are both property of the authors