Bolly1965 Posted February 3, 2013 Share Posted February 3, 2013 My Bessacarr E765 has a Dometic GY20 mushroom vent above the fixed bed. Dpes anyone know if these are permanently open or can they be closed? Gets a bit drafty at times Link to comment Share on other sites More sharing options...
Robinhood Posted February 3, 2013 Share Posted February 3, 2013 The Dometic instructions are less than informative (though there is reference to closing the vent under certain conditions in a marine environment). A combination of comments on the web, and a perusal of the cutaway drawing on the installation instructions imply that the vent can be opened/closed via a push/pull action on the central knob (push up for open, pull down for closed). (and if you break it in trying, I won't be held responsible ;-) ) Link to comment Share on other sites More sharing options...
Bolly1965 Posted February 4, 2013 Author Share Posted February 4, 2013 The central knob moves slightly but I don't want to force it. Link to comment Share on other sites More sharing options...
Robinhood Posted February 4, 2013 Share Posted February 4, 2013 ....I think I would also be careful. :-( Various sets of sales literature refer to the vent as being "A passive ventilator with easy push/pull closing action". The sample installation/operating dowloadable instructions here: http://www.dometicmanuals.com/PROD%5CMASTERDometic.nsf/by+PNC/EF11D7D2D8884659C125700C002C359E?opendocument refer to being able to close it (particularly in the marine environment, but don't show how). The accompanying cutaway drawing, however, indicates that a push/pull action on the centre knob would probably move the internal "mushroom" of the vent, opening or closing the aperture. Good luck! Link to comment Share on other sites More sharing options...
Kassbmw Posted August 7, 2015 Share Posted August 7, 2015 I have just had a similar issue with my recently purchased 53 plate Bessacarr E745. - My vent is permanently stuck open. Investigation reveals an additional circlip attached to the plastic shaft. The unit has to be removed (6 screws to the main body and 3 for the casing) then the circlip can be removed simply by prying off with a screwdriver. Be careful though, with age comes fragility. I suspect the circlip was added to keep the vent open at all times for air circulation. Keep on Truckin' Link to comment Share on other sites More sharing options...
Derek Uzzell Posted August 7, 2015 Share Posted August 7, 2015 This document (published September 2013) for Dometic GY20/GY21 roof vents http://td.dometicgroup.com/_pdf/gy20-21-eb-16s-01.pdf says "Opening and closing the roof vent - Turn the cover cap anti-clockwise to close the vent.” As it is also advised that "The roof vent must always be open when used in a caravan”, you may well be right to suspect that a circlip was added to the plastic shaft at some stage to prevent caravan/motorhome owners from closing the vent by moving the central knob. Link to comment Share on other sites More sharing options...
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