Stephen Lagueux Posted July 27, 2013 Report Share Posted July 27, 2013 Twinhouse, what should be the proper clearance in between the 2 chimneys? The distance here is 20 inches. Click to Enlarge 70.81 KB Quote Link to comment Share on other sites More sharing options...
Rob Amaral Posted July 27, 2013 Report Share Posted July 27, 2013 Looks like the short-guy is too close to that roof vent , monsieur... The chimney-to-chimney issue is not an issue (to me..) Quote Link to comment Share on other sites More sharing options...
Stephen Lagueux Posted July 27, 2013 Author Report Share Posted July 27, 2013 Looks like the short-guy is too close to that roof vent , monsieur... The chimney-to-chimney issue is not an issue (to me..) That's right!! the vent requires a 4 ft clearance, thanks for reminding me. Quote Link to comment Share on other sites More sharing options...
Garet Posted July 28, 2013 Report Share Posted July 28, 2013 the vent requires a 4 ft clearance Where does that come from? Is it a Canadian thing? I'm not saying that having an exhaust terminate near an attic vent is a good idea, but air is generally going out the attic vent, not in, and the attic isn't open to the living space. So I'm having a hard time imagining bad things happening. Quote Link to comment Share on other sites More sharing options...
Inspectorjoe Posted July 28, 2013 Report Share Posted July 28, 2013 That's not something I would comment on. Quote Link to comment Share on other sites More sharing options...
Stephen Lagueux Posted July 28, 2013 Author Report Share Posted July 28, 2013 That's not something I would comment on. you're right, in that case it is not that critical and it is not really worth mentioning. The 4 ft clearance is from the manufacturer's installation guide. The vent should not be closer than 4 feet to any structure, wall, chimneys or anything that is higher. Quote Link to comment Share on other sites More sharing options...
Rob Amaral Posted July 28, 2013 Report Share Posted July 28, 2013 I agree also.. it would have to be an odd situation for the air to go in... Just looks kind of odd like this... air is always rising out that vent... Quote Link to comment Share on other sites More sharing options...
Hearthman Posted July 28, 2013 Report Share Posted July 28, 2013 Most mfrs. of factory built fireplaces go with a separation laterally of 16-18" and a vertical separation of about the same for round terminations. Square terminations are of course at the same elevation. When spaced too closely together, you run the risk of smoke/fumes/ heat from the lower exhaust being entrained into the concentric cooling space of the higher unit or being recirculated back into the home if under negative pressure. In the case where one chimney is for a heater, you always want the gas, oil or coal fired appliance's termination higher than any of the others due to the corrosive action of the exhaust as well as possible odors or CO. If the side of the taller chimney is showing signs of corrosion, call for replacing that section but also separate them wider with the heater exhaust higher than a fireplace or woodstove. In the case of a gas direct vent, discharging one heater too close to the termination may result in ghosting, delayed ignition, corrosion of the firebox, sooting, odors, or CO into the home. Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted July 29, 2013 Report Share Posted July 29, 2013 What's the fuel source for this chimney? Just curious if those are really vents, or chimneys? Quote Link to comment Share on other sites More sharing options...
Stephen Lagueux Posted July 29, 2013 Author Report Share Posted July 29, 2013 those are wood fire place Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted July 29, 2013 Report Share Posted July 29, 2013 Reason I asked.... It doesn't look like that chimney extends up 3' above the roof penetration point. Is that required where you're at? Quote Link to comment Share on other sites More sharing options...
Stephen Lagueux Posted July 29, 2013 Author Report Share Posted July 29, 2013 Reason I asked.... It doesn't look like that chimney extends up 3' above the roof penetration point. Is that required where you're at? yes, a 3 ft minimum height is required and the chimney should be 2 ft higher than any structure in a 10 ft radius. In that case, I suspect the taller chimney was installed after which would explain the height difference and the roof vents are brand new. Quote Link to comment Share on other sites More sharing options...
SNations Posted July 30, 2013 Report Share Posted July 30, 2013 Reason I asked.... It doesn't look like that chimney extends up 3' above the roof penetration point. Is that required where you're at? yes, a 3 ft minimum height is required and the chimney should be 2 ft higher than any structure in a 10 ft radius. In that case, I suspect the taller chimney was installed after which would explain the height difference and the roof vents are brand new. Around here it's sort of common practice to stagger the heights of flues that are near each other, so I don't think the different heights necessarily indicates that they were installed at different times. And I don't think the 3-2-10 rule applies to other nearby flues. Quote Link to comment Share on other sites More sharing options...
Stephen Lagueux Posted July 30, 2013 Author Report Share Posted July 30, 2013 Around here it's sort of common practice to stagger the heights of flues that are near each other, so I don't think the different heights necessarily indicates that they were installed at different times. And I don't think the 3-2-10 rule applies to other nearby flues. Thanks for the info. I'm no chimney specialist. WETT certification should be my next formation. Quote Link to comment Share on other sites More sharing options...
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