You will see in the picture to the right that the cylinder is wider at the top and then tapers down at the bottom.
Roto closure dimensions
The full length of it is 2-3/4″. There is no weight limit listed on the closure box. We use this roto closer on large 24″ x 24″ side-hinged doors that weigh about 50 lbs, so if your door is that size or smaller, it should work well. Most of these types of closures attach the same way so a retro-fit should not be too hard to do if needed. This roto closer will fit ideally in a Midland Chutes side hinged laundry chute intake door, and similar doors. It is commonly thought of as universal closure for most side hinged doors. Below is another picture of the roto closure and note that it come as a kit with all the hardware necessary for assembly. This closer will fit the following size doors 15 x 15, 18 x 18, 21 x 21 and 24 x 24.