Overview
Step up from 3" to 4" vent — required for long runs and high elevations.
The DuraVent 3"-to-4" black increaser lets you upsize to 4" PelletVent Pro, which ComfortBilt recommends when flue height exceeds 12 ft, at elevations above 5,000 ft, or when your layout exceeds the 3" EVL limit.
Why buy from StoveSource: Authorized dealer · Free shipping over $250 · No sales tax (except WY) · 1-888-914-0022
Shipping & Returns
Free shipping on orders over $250 · ships in 1–3 business days.
Free shipping on orders over $250 to the continental US; a flat $19.99 shipping fee applies to orders under $250. Accessories and parts ship by parcel carrier (UPS, FedEx, or USPS), typically in 1–3 business days.
Returns. Unused, uninstalled items in original packaging can be returned within 30 days, subject to a 15% restocking fee.