Ken:

The small holes are 5/32" and the larger holes are 1/4". The can is 13-1/4 inches OD so there are 26 holes total.

The wood burns quite well....possibly because 90% of the wood we have around these parts are pine, fir and cedar. As you know, these softwoods burn fairly fast and don't leave much of an ash pile. As I wrote earlier, I use pine cones over any other wood as it is superior in this type of stove.

I bought 2 paint cans so I may experiment with the other to see if larger / more holes makes any difference.