Fig. 3
Gas exchange chamber with CO2 scrubber connected (a, b). Design details (c), indicate intake for soda lime scrubbing tubes (1), ambient by-pass air and manual control valve (2,3), lower chamber of fully scrubbed air (4), open-cell foam air filters (5), mixing chamber for by-pass and scrubbed air (6), centrifugal fan (7) and outlet to chamber (8). The lower pipe fitting below the by-pass valve is only included for support of the intake chimney, and is not continuous with the lower chamber of the scrubber