Most recent (all I know) FFMs have an inner mask to keep dead space
down. On exertion, CO2 buildup is usually not a problem, because of the
increased tidal volume.
Some FFMs have an integrated mouthpiece, so eevn less dead space, like
in any 2nd stage.
However, with this kind, it may become a nuisance to get water out.
Earlier types of FFMs would definitely give you a headache because of
CO2 retention.

Matthias

How about C02 buildup in the added space..  Particularly on the Doria.. 
Last time I did the Doria we were in 2
knot currents and kicking to get back to the line could have easily made
for a C02 buildup and the last thing I'd
want to worry about is a FFM...
--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]