Secondary burn tubes holes-horizontal or vertical?

[RedRanger]

I notice that the four of mine have the air-tube holes horizontal facing the front of the insert. Which makes for a nice light show :coolsmile: Did I not read on this forum that some of the air-holes are facing straight down? If so, any advantage one way or the other? Just wondering cause my light show can start as early as 350F as measured by the thermometer on the top of the insert.

 

[Corey]

Most all I have seen are horizontal and face the front of the firebox. The flames from the back tubes project forward and add extra heat to the tubes in front. Seems like there might be a slight bit to be gained by angling the front tubes to blow slightly downward as that might create a little more turbulence in the air and also start the combustion slightly sooner allowing more of it to take place in the firebox...though I would expect the difference to be pretty small.

 

[SlyFerret]

The manual for my 30NC shows each of the tubes holes positioned at specific angles, not just horizontal or vertical.

-SF

 

[Tfin]

The manual for my 30NC shows each of the tubes holes positioned at specific angles, not just horizontal or vertical.

-SF

Same with my 13NCP......the manual specifies specific angles for each. The one in the back faces the furthest down and the one in the front faces the most horizontal.

 

[trailblaster]

Our 1700 has the front facing front and the others turn down slightly as they go back.