Effectively terminate a rectangular stack duct run with this Imperial Rectangular Stack Duct End Cap. The 3-1/4-in x 10-in duct cap is used to block off a rectangular stack duct run within an HVAC system. A versatile tool, this end cap can be used to create a straight-line transition between round pipe, or a transition between an insulated flexible duct and regular stack duct.. Built to last, this blind end cap is constructed from 30-gauge galvanized steel for rust resistance and durability. The end cap is easy to install with sheet metal screws for a secure fit (screws sold separately). It is suitable for use in most heating, venting and air conditioning applications.
- Terminates a main stack rectangular duct run 
- Can be used to block off a run of wall stack or transition between duct or round pipe 
- Constructed from 30-gauge galvanized steel for durability and rust resistance 
- Easy to install with sheet metal screws (not included) 
- Suitable for use in most HVAC applications