These chimney tops are vented on the sides and open on top as well.
This steel chimney top is formed to match a standing seam metal roof.
This customer has copper gas-fired lanterns along the front of his house and asked me to make a chimney top in the same style. Brass bars support a copper screen across the openings.
Multiple copper features can create a nice theme. Each of these chimney tops is a different size with the largest one at 8 feet long.
For this home with 10 chimneys and many other copper details, I made these custom shrouds out of all copper including the copper screen for keeping the birds out. Over time the copper will weather into multiple dark colors for a old world look.