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A hydrothermal vent is a fissure on the seafloor from which geothermally heated water discharges. Hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart at spreading centers, ocean basins, and hotspots. Hydrothermal deposits are rocks and mineral ore deposits formed by the action of hydrothermal vents.
Hydrothermal vents exist because the earth is both geologically active and has large amounts of water on its surface and within its crust. Under the sea, hydrothermal vents may form features called black smokers or white smokers. Relative to the majority of the deep sea, the areas around submarine hydrothermal vents are biologically more productive, often hosting complex communities fueled by the chemicals dissolved in the vent fluids. Chemosynthetic bacteria and archaea form the base of the food chain, supporting diverse organisms, including giant tube worms, clams, limpets and shrimp. Active hydrothermal vents are thought to exist on Jupiter's moon Europa, and Saturn's moon Enceladus, and it is speculated that ancient hydrothermal vents once existed on Mars.

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  1. C

    Gravity Fed system in Bungalow with two Automatic Air Vents

    Hi, I’m replacing my old Honeywell Smartfit system on a oil fired gravity-fed system in a bungalow. I’ve read conflicting advice on gravity fed systems requiring an AAV, unless in a bungalow to aid bleeding on first fill? One AAV is in the loft on - what I think - is the boiler return pipe...
  2. T

    URGENT sewer smell coming through heat vent

    Everytime my heat comes on I get a sewer smell coming through the air vents.
  3. Bogart

    Position of air vents

    Hi Right I have quite a few questions about the current setup as shown in attached piccy. Manual air vent B in picture is on return leg, Auto vent A is on flow leg, but only on heating flow. My intention is to get rid of the pipework C to C which as you can see for some obscure reason goes too...
  4. Meady

    Filling loops + automatic air vents for sale.

    I have 16 x Tradefix 15mm Straight Filling loops for sale, would like to sell them all together for £90 posted mainland UK. I also have 17 x Emmeti Tecno Varia 1/2 inch automatic air vents for sale, looking for £10 each posted for these to mainland UK. Cheers
  5. P

    Automatic Air Vents?

    Hello My new boiler has a built-in AAV. The old AAV in the airing cupboard upstairs is gunked up and not working. I assume there's no need to replace this....? Thanks Chris
  6. C

    Height of bottle vents.

    Hi, I need to install some bottle vents in the flow and return of the central heating pipes. last time I fitted tee’s to the 22mm pipes, then a valve then the bottle vent. So the bottle vent was only 12cm above the pipe, this resulted in air being dragged in. I’m going to refit them today as...
  7. D

    Flies from vents into cavitys

    I am aware of flues being 300 from an openable window or vent but what if the vent goes into the cavity but not the room inside? Where does that stand?
  8. Gasmk1

    Airflow 9"x6" telescopic air vents x2

    i have 2 of these in terracotta still boxed bought for a job but never used cost about £15.00 each will take £10.00 for both collect in warrington area PM for details TEL 96 (9" x 6") - Ventilator | BES.co.uk mark
  9. M

    Soil stack vents!!!!!!!!!

    Ive got a big project on the go of a office conversion to flats and at the moment, due to the terrible lay out we have 11 soil stacks in the loft all over the place. The architect wants all the vents to exit in a nice line at the rear of the property which is going to mean massive runs of 110...
  10. T

    Automatic Air Vents - How Many are required?

    Hi Guys, My son has just had a his plumbing done about a year ago and one of the air vents seems to be bubbling/leaking up. I have attached some pictures, I can see a total of 3 air vents, flow and return near the boiler hve one each and there is one on the return on the return pipe near the...
  11. C

    Can you use drain cocks instead of manual air vents?

    Hi, Doing a DIY central heating install mostly in speed fit but need to put in some air vents. Because of space only manual ones will fit, but as they need to be soldered and i have no experience of soldering, is there any reason i cant use draincocks instead? Thanks
  12. jaydebruyne

    Flues and vents

    I can't find anything in the viper book about this. Minimum distance from flue to boundary of next house is 600mm.. What if that wall had 2 air bricks and a vent?? Actual distance is 1.3m. Gonna replace the boiler but need to know if I need a plume kit. Will be fitting a Vaillant ecotec Plus...
  13. eagleeye

    Air lock

    Just fitted new boiler and cold water storage tank in a town house in Hampstead. Over the top of the old galvanised tank was 4 15mm vents. Plumbing system very pour in this place. Cold tank in roof box over top floor. Cylinder below (not directly) on second floor below. Cylinder has surry flange...
  14. G

    Additional air vents on combi pipework

    A customer has a boiler that is sludge up and going to lockout. British gas are insisting on powerflush ok, and fitting an extra automatic air vents on both the flow and return pipe work above the combi boiler because of possible air locks. The system is 15yrs old and I am planning to...
  15. michcosg

    Automatic Air Vents work?

    Hi Folks I maintain a small community centre's radiator system which is served by what looks like 1 1/2" steel pipe. Anyway an issue I am usually called out twice for in the early winter, is to vent this 1 1/2" pipework using the manual air vent on in particular the upper of these two pipes...
  16. B

    2 fires vents

    In a terrace where the wall has been removed between living rooms and folding 4 piece doors fitted and there is a 6.7kw fire in each is it classed as one room or 2. For ventilation.
  17. K

    Two open vents on same system?

    Is there any reason why you can't have two open vents on the same system? Under normal conditions the pumped circuit from the stove would feed the cylinder directly and in a power cut the gravity circuit could continue to operate via a coil, unaffected by the pump circuit, least that was the...
  18. H

    Ventilation and meter housing

    Hello First post - found this forum via a google search and a similarish question 3 years ago. I am not a professional and am not attempting diy - just wondering if guidance re cavities and meter housing could be cleared up a bit more for me. Situation is we moved into new home, discover...
  19. P

    Draught free vents

    Hi Guys Quick question, I am wondering where the best place to get appliance vents with draught restrictors in is? I have a open flued boiler I need to install vents for Hi is 106cm2 free area & Low 212cm2 free area. the customer is concerned about draught and security issues... :banghead...
  20. S

    Ventilation

    Hey guys, I'm sure this comes up a lot but I was hoping someone could help me out. I recently bought a new house with a Baxi Bermuda 401 back boiler in the lounge and an old gas fire over the front of it. I was surprised to find that the ventilation was located in the kitchen with no vents...
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