Why is a metal vent often preferred rather than a masonry chimney?

A metal vent is often preferred over a masonry chimney due to its lighter weight, easier installation, and lower cost. Metal vents can be more efficient in venting gases due to their smooth interior surfaces, which reduce the risk of creosote buildup. Additionally, metal vents can be more flexible in design, accommodating various configurations and installations. This combination of benefits makes metal vents a popular choice for modern heating systems.