Air over/under?

[Mitchell tapper.]

I did something similar on my 2x4. Instead of a plate, I made an angle iron frame to set the refractory on. Then made a wood mold to make the base. Set it on the frame then filled around the edges with more refractory to seal it up. I did add wire so if it cracked it would still hold it together. Doesn’t appear to have cracked though after 4 seasons of use. I fire with a blower, keeping the firebox full of wood as hard as it will run.4B58790E-818F-482A-98E8-7CAF026855E5.jpgEFB403C5-1B18-4246-8E74-0A06219386F7.jpg

[murferd]

When I did our 30" x 10' conversion from oil to wood, I used fire brick with three or four 3/4 holes in each brick with high pressure blower. Didn't seem to boil good enough to suit us, made a grate system out of 2" angle, V up with 3/4 gap between each & the sides. Wow, wouldn't know it was same machine. Angle has never changed(warped) since we put it in, once full of ashes it's fine. The fire brick thing was a lot of work, save yourself some aggravation.

[mol1jb]

We also use a metal grate of angle iron up vvvvv. Easy and quick to weld up and works great.

[doop]

This is what I'm trying to do, I'm not looking for grates I'm looking at forced air from above and below the fire.Combustion Efficiency for Maple Producers - University of Vermont

PDFUVM.edu › ~pmrc › Combustion

[DocsMapleSyrup]

Doop. Sent you a PM