• Aluminum construction
• Snap-Lock™ male and female tails connect to standard 4″ connections or snap without clamps to other snap-lock collars
• Four mounting holes
3 versions available:
- Back draft flapper on exhausts
- Intake does not have flapper
- Grid on fresh air intakes and screened exhaust is metal ¼” x ¼” , with ¼” round holes
Built by Builder’s Best in the USA.