Thanks! I'm going to give this a shot and see how it goes. I picked up a CO2 meter a while back. Have not tried it out yet, but here is the one I got. http://www.amazon.com/gp/product/B001PDGFR8/?tag=skimlinks_replacement-20
The sink looks amazing! I wish I had room for something like that.
Correct- That's for an electric based brewery. There are no poisonous gases with with an electric brewery and there is considerably less heat too (none is wasted since the element is in the wort/water). Marty has gas burners that have to produce a lot more heat (and poisonous gases as a byproduct) so the venting requirements are much higher than electric. Definitely ask again.With respects to ventilation, I was advised to use a fan that was 400 CFM or higher even though my elements are only 5500w. Anything over 500 is likely overkill for an electric brewery.
I'd be surprised if you have a carbon dioxide (CO2) detector as that's what we breath out (and plants like). It's also what yeast expels when fermenting and what we carbonate our beer with. I don't know why these sorts of detectors would even be available for sale in the first place or why you would want to have one?
Carbon Monoxide (CO) is the one you care about: It's the poisonous gas that is expelled when natural gas and propane is burnt. It's a colorless, odorless, and tasteless gas that is toxic to humans above certain levels.
If you have the CO detector in the same spots where you are working in and around the kettles and it's not going off then you're probably ok and the poisonous CO is being expelled correctly, assuming it's working correctly. There may be higher concentrations that would would normally be permitted near/in/around the kettles so you may want to try moving the detector around a bit to where you normally work. For example, it's not uncommon to have our head/face pretty close to the boil kettle when working.
Kal
To the OP and trimixdiver1: Not to derail this thread any further, but why do people want a CO2 detector? Why do you use one? (Google isn't helping - it thinks I want to know why someone would use a CO detector).
Kal
Based on some quick searches, John Blichmann's requirements of dividing the BTU's by 30 seem about twice as high as what the interwebs recommends which is (generally speaking):
For gas cooking surfaces or range, a minimum ventilation level of 100 CFM (Cubic Feet per Minute) per 10,000 BTU is recommended. However, the hood must have a minimum of 500 CFM of ventilation power.
Duct work and elbows and other things increase the CFM requirements because they add restriction which (depending on the fan model) can severely lower the CFM. For example, every 90 degree below on a 6" duct can add the equivalent of ~25 feet. A good rule of thumb is to add 10 CFM for every foot of ductwork and 25 CFM for any elbows.
So an example: Say you have a 80,000 BTU burner (fairly typical) with 20 feet of run and 3 elbows. That would require 800 + 20 + (3x25) = 895 CFM.
Equally important in many houses is the make up air. Most modern houses are so well sealed that the make up air has nowhere to come from (unless you open a window).
More food for thought.
Kal
The numbers I posted and you quoted were actually taken from various sites after I Googled "how many vent hood CFM per BTU?" - they're all about kitchen stove venting. Most say 100 CFM per 10,000 BTU plus extra to make up for the ductwork/elbows.This got me thinking about home ranges.
Really? I would say the opposite. It's the 50+ year old houses I see that have hoods with charcoal filters that vent directly into the house - they're electric too since back in the 40's and 50's everyone had electric stoves.Given that most kitchens have zero external ventilation these days...
Correct. Newer homes are much tighter and the chance of pulling air from places like a fireplace is a concern (you could suck embers right into the house when your turn on your stove fan). This is why building code changes over time as house construction changes. The two go hand in hand.Also, depending on how "tight" Marty's house is for every CF of dirty air he pushs out of the basement a fresh CF has to come from somewhere. I would assume a lower volume is quite capable of squeezing through standard home gaps (doors, windows, soffit vents) but at a larger CFM wouldn't, one run the risk of pulling air back through other vents (furnace, hot water heater) unless additional intake air was made available to the home?
Really? I would say the opposite. It's the 50+ year old houses I see that have hoods with charcoal filters that vent directly into the house - they're electric too since back in the 40's and 50's everyone had electric stoves.
Correct. Newer homes are much tighter and the chance of pulling air from places like a fireplace is a concern (you could suck embers right into the house when your turn on your stove fan). This is why building code changes over time as house construction changes. The two go hand in hand.
My current home is new and build to our region's 2010 code standards. While it varies by region, part of this standard is that a whole house make-up air system must be installed if the range hood is more than about 300 CFM. So we have a large (12") duct in the basement feeding into our HVAC cold air return that's connected to the outside, with a damper valve that opens/closes whenever the we use the range hood. There's a 3000W electric heater in line too to avoid freezing/condensation in the winter. All of this extra expense is required because homes are built so super tight these days to save money. Ironic that the make-up air system wasn't cheap - it cost more than your average range!
HRVs and ERVs (air exchangers) are also more popular given how tight houses are today. The air in the house gets stale from cooking, breathing, off-gassing of man made materials, etc.
Definitely a conversion for a separate topic like you mentioned!
Kal