>my boxes are all considered standard size here in Canada. THey measure16.5 inches width, 20 inches length, and 9.5 deep.

More likely 16.24 inches by 19 7/8" by 9 5/8" deep. But some are as small as 9 1/4" deep.

> What are these called?

Deeps. Some just call it a "brood box" but you could use any box for brood. I use eight frame mediums for everything.

> They can hold ten frames and I have always used ten or briefly nine frames because otherwise I got burr comb. What is the expected yield/hold of honey in a body this size?

They weight 90 pounds or more full of honey. But, of course, some of that weight is the box and the frames. I would expect to get 70 pounds or more from one full of honey.

> I have assumed these are what yall call deeps?

Yes.

Standard 10 Frame boxes

Name(s) Depth Weight full of honey Uses (cmb=comb ext=extracted)

Jumbo, Dadant Deep 11 5/8" 100 - 110 pounds Brood

Deep, Langstroth Deep 9 5/8" 80 - 90 pounds Brood & Ext

Western Bee Supply? 7 5/8" 70 - 80 pounds Brood & Ext

Medium, Illinois, 3/4 6 5/8" 60 - 70 pounds Brood & Ext & Cmb

Shallow 5 Â¾" or 5 11/16" 50 - 60 pounds Cmb

Extra Shallow, Â½ 4 Â¾" or 4 11/16" 40 - 50 pounds Cmb