4 inch
- DuraVent PelletVent 4
- DuraVent PelletVent Pro 4
- Metal-Fab Pellet/Biomass 4
- Metal-Fab Premium Biomass 4
- Metal-Fab SuperFlex Chimney Liner 4
- National Chimney M-FLEX 4
- National Chimney Smoothwall 4
- Security Chimneys Secure Pellet 4
- Security Chimneys SPX 4
- Selkirk Direct-Temp Multi-Fuel 4
- Selkirk Ultimate Pellet Pipe 4
- Selkirk VP Pellet Pipe 4
- Selkirk Stainless Flexible Liner 4
- Vortex 4
