Typical costs: 1  Replacing aging, leaking or inadequate ductwork typically costs about $35-$55 a linear foot for labor and materials, or $1,000-$5,000 or more for a single-family home, depending on the length and type of ducts used (sheet metal, fiberduct or round flexible ductwork) and local rates.
Not Veterinary Advice: No. A snail is not meant to shed or molt its shell and snails normally will not shed their shells. However, it can happen by accident, which usually leads to the snail dying.It's thought to be possible that some snails could live without their shells, until they form a new one, but this is considered unlikely.Snails are unable to reattach to their shells if they become separated, but it may still be possible for them to use the shell as shelter temporarily.owever, it can happen by accident, which usually leads to the snail dying. It's thought to be possible that some snails could live without their shells, until they form a new one, but this is considered unlikely.
Differences in Shell. The long body and tentacles of slug is very similar to those of a snail, but the main physical difference between the two species is the shell.The snail uses its shell as an external attachment to protect and cover its body.The slug, however, has a small inner shell, which lies underneath the skin. Slugs and snails both breathe through an air hole on their mantle, called a pneumostome. On snails, the pneumostome lies is juxtaposed next to the shell.he snail uses its shell as an external attachment to protect and cover its body. The slug, however, has a small inner shell, which lies underneath the skin. Slugs and snails both breathe through an air hole on their mantle, called a pneumostome. On snails, the pneumostome lies is juxtaposed next to the shell.