This is the official OEM Empire Wall Furnace vent extension 4″ inner length.
This is only the 4″ inner exhaust piece. You may need to order the (DV-845) Outer air intake vent piece as well
Empire Part Number: DV-844
Allows you to install your Empire DV25 & DV35 wall furnace on walls between 13″ & 19″ inches thick
When installing an Empire wall furnace, sometimes there is vinyl or wood siding on the outside. If so you will also need a DV-822 Vinyl Siding Shield. This siding protector allows the furnace to operate without damaging the outside of the home.