Height is a matter of personal taste. Typically lamp chimney rises 2″-4″ above top of lamp shade.
Bottom diameter is measured outside edge to outside edge. Most burners have a narrow seat for chimney to rest on.
If having trouble getting an accurate diameter. Test by cutting a ring to needed diameter. Slip down over burner to check fit.
Fit: The chimney should put slight pressure on the tines of the chimney holder or burner which in turn holds the oil lamp chimney in a stable position. This ensures a proper updraft enabling the burner to function correctly. Make sure chimney fits securely if using on an oil lamp.
I was looking for a specific size and width to replace a broken chimney on a lamp. Nothing in stores locally nothing in Amazon but anything you could need found at Paxton's. Fast ship packed well and priced right. What more could you need?
The supplied glass chimneys arrived in perfect condition due to proper packaging by Paxton. I have been looking for glass chimney replacements for over 2 years when I came acrooss this great supply house. Thank you