The way i read it is that the clearances for a single wall are the same as double wall pipe regardless of the surface protection meaning a 21 in.
Double wall stove pipe wall clearance.
Most of the double wall stove pipe allows for 6 clearance from wall combustibles and 8 from ceiling combustibles.
Double walled or close clearance stove pipe is used to connect your stove to the chimney.
Double wall pipe should not be cut.
Using a heat shield on a single wall stovepipe allows you to reduce the clearances from 18 to 6 to the wall and 9 to the ceiling.
To 6 in the closest clearance to a wall of any connector pipe.
Dvl s double wall air insulated design reduces clearances to combustibles from 18 in.
While not the best readable text i would think the n a under the protected surfaces section of the table means it defaults back to the unprotected surfaces side which have greater clearances than compared to the double wall pipe.
Dvl double wall stovepipe completes the venting system when used with one of duravent s chimney products such as duratech duraplus or duraplus htc.
Clearance to non combustible materials is 0 but pipes should not actually touch cement bricks or other non combustibles.
Double wall stovepipe is used when you don t have 18 or more clearance from combustibles.
Double wall stove pipe can reduce the clearance needed to combustibles in many situations and typically has a stainless steel inner wall that will provide a much loger time of service that a typical single wall setup.
This pipe has a clearance of only 6 to combustible materials and keeps flue gases warm for better draft.
6 7 8 inner diameters.
When combining lengths remember to subtract 1 5 from each to account for overlap.
Double wall system features a black aluminized steel outer casing and stainless steel inner liner.
These pipes only need a 2 inch clearance to combustibles because they remain cool on the outside while their internal design allows them to withstand temperatures as high as 1 700 or 2 100 degrees fahrenheit for a limited time.
The clearance to combustible materials for double wall stove pipe such as standard drywall or wood is 6 to walls and 8 to ceilings.
A class a chimney pipe requires less clearance than a single or double wall stovepipe which is only intended for use within the same room as the stove.
I think you are a bit confused and need clarifications first of all single wall pipe clearance to combustiables is 18 and that is in all directions we are talking about the pipe th extends fron the flue collar into a chimney meaning class a chimney in your case double wall connector pipe distance to combustiables is set by the manufacturer usually 6.
Double wall stove pipe double wall stove pipe is used to make the connection from the chimney or chimney kit to the appliance in the final interior run.
