Inside the firebox, this tube feeds preheated air into the combustion zone above the fire, and the Enviro Secondary Air Tube - Middle (50-1101) replaces the worn or cracked middle tube in compatible Enviro 1700 series wood stoves and inserts. It ships as a genuine Enviro part, not an aftermarket copy.

Purpose

Secondary air tubes introduce preheated air above the firebox so wood gases mix with oxygen and burn cleanly rather than escaping unburned. A damaged or deteriorating tube disrupts this process and reduces the appliance's overall efficiency.

Key Benefits

• Restores factory-designed secondary combustion for a cleaner, more efficient burn
• Direct-fit replacement for the middle position — no modification needed
• Genuine Enviro part, not an aftermarket reproduction
• Fits four compatible Enviro 1700 series models on record

Other Notes

This tube is the middle position only; two air tubes are typically required per appliance, so inspect the remaining tube for cracking or warping before reassembly.

While replacing this tube, check the associated baffle and any adjacent air tubes for scaling, warping, or burn-through, since these components wear together.

Not sure it fits your unit? Contact us with your model number and we'll confirm before you order.