Secondary air tubes feed preheated air into the top of the firebox, where it mixes with wood gases to sustain a cleaner, more complete burn. The Enviro 1200 Middle Air Tube, also known as Air Tube D (50-1103), replaces a worn or cracked middle air tube in compatible Enviro 1200 series wood-burning appliances and is genuine Enviro factory stock.

Purpose

This tube supplies combustion air to the upper firebox, supporting the secondary burn that keeps a wood stove or insert operating efficiently. All secondary air tubes must be in place for the appliance to function as designed.

Key Benefits

• Supports proper secondary combustion for safer, more complete burning
• Genuine Enviro part built to original specifications
• Direct-fit replacement for the middle air tube position
• Addresses cracked or deteriorating tubes before they affect burn quality

Other Notes

A cracked or sagging tube is usually visible on inspection; replace it as soon as damage is found rather than waiting for a full failure, since the appliance depends on all air tubes being intact.

While inspecting this tube, check the front and rear air tubes and the baffle for the same wear, since all three components sit in the same combustion zone and tend to age together.

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