Cant find Barometric Relief Valve

Hi Does anyone have a link to supplier of barometric relief valves ? many thanks

johnp wrote:

Hi Does anyone have a link to supplier of barometric relief valves ? many thanks

There is no such animal........... Do not go to Home Despot - those people would not know a part if it bit them - go to a plumbing supply house - a real one - and tell them that you want a barometric damper (also known as a Brometric Relief) But there is no valve involved here. This is an example of what you want: http://www.smarthomeusa.com/Shop/RCS-Bypass-Dampers/ Rod

Thanks Rod, it seems that the word Barometric gets folks here in the UK confused. I tried CCL Veloduct who appear to be a leading supplier of all things to do with Air Conditioning here and they said that they never heard of such a thing. I guess thats probably becasue i wasn't speaking to an engineering sales specialist and probably the commercial sales rep. Anyway, i looked at their site, and the closest i see to the example is this http://www.cclveloduct.co.uk/Default.as ... egoryID=35 However, this looks to me that you set it at a fixed position I guess i could also try to see if the folk at SmartHomeUSA would ship to the UK ? What would the 12V AC motor be used for ? Would it be similar to the one from CCL where you would essentially set the butterfly valve to a certain position and then in this model, air presure would open further accordingly or would this somehow be linked to some kind of sensor in the duct that can feedback pressure to control the motor ? Many Thanks John

Talk to the companies who are selling boilers - they use them to balance the static pressure of the stack outlet (just before the chimney) I spaced for a moment - the motorized ones are fine with sensors - but not really needed - let me find you the passive ones. http://www.northlineexpress.com/itemdes ... =5CO-32120 Print the picture and take it to someplace that sells boiler parts. Rod

Thanks Rod I'm visiting NW US in the next few weeks and so might try and pick one up. rgds

Rod An additional question(s) if i may. I'm installing a mini split ceiling ducted unit manufactured bu Mitsubishi Electric. I'm currently plannin to NOT install into the celing but into a seperate mechanical room which i will be 'bolting' onto my studio. So far my Air Con working assumption is 1. Low Velocity / High Volume (as per your book) 2. Fresh Air Intake will be as close to the air handler intake as possible, on the duct return. For my installation, this will almost certainly be approx 12" max 3. Barometirc Damper will be on the supply duct approx 10' from air handler. Question 1: Does the above configuration work or am i mistaken ? Question 2: Does the Barometric relief vent to the outside, or could this be fedback to the return duct ? Many Thanks John

johnp wrote:

1. Low Velocity / High Volume (as per your book)

GOOD

2. Fresh Air Intake will be as close to the air handler intake as possible, on the duct return. For my installation, this will almost certainly be approx 12" max

That works

3. Barometirc Damper will be on the supply duct approx 10' from air handler.

Fine

Question 1: Does the above configuration work or am i mistaken ?

WIll work fine as long as the barometric damper is set properly.

Question 2: Does the Barometric relief vent to the outside, or could this be fedback to the return duct ?

No - it has to vent to the outside - otherwise fresh air flow will stop.

Thanks again Rod cheers

Rod, closing the loop on this thread Armed with my new found knowledge about NOT relying on Air Con suppliers to provide Barometric Dampers and to extend search, I found this:- http://www.kuranda.co.uk/dickinson-heat ... 5-548.html Hopefully, this will be useful for other folk on this alias, especially those based in the UK cheers John

Perfect - now if a monitor can move this to a spot where it won't get lost that would be great. Rod