On the line, annealing isn’t just a step you check off. It’s the last shot you get to pull thermal stress out before the glass ships. When the oven can’t hold uniform temperature, you pay for it in warp, optical distortion, and scrap that shows up as rejected insulating glass units or bent glass that misses the geometry. We built our industrial annealing oven for floors where uptime, repeatability, and power cost are the real scoreboard. What actually matters under the hood We match the heating system to the glass with medium-wave infrared elements, chosen around emissivity. The response is quick, and zone control stays tight. In a typical 24 m tunnel, we hold the soak band within ±2 °C, so the lehr curve doesn’t drift when load spacing changes. High-efficiency insulation and recirculated air ducting cut waste heat loss, and variable-speed fans keep convection steady without overdriving the motors. The control interface stores product recipes and logs dwell time, so the same annealing schedule runs shift after shift without guesswork. Why this holds up in production High-throughput glass work punishes slow recovery and uneven heat. The oven snaps back to setpoint fast after a changeover, then holds the soak profile so stress relief happens evenly across the sheet. That means fewer tempering rejects, cleaner opticals on coated glass, and less rework getting glass ready for lamination. Energy use drops because the system spends less time chasing temperature and less time idling wide open. In a 24/7 plant, the reduction in kWh per square meter adds up quickly — and it shows up on electricity demand and peak load charges. The details that bite you if you ignore them Installation tolerances are tight. Conveyor tracking and air seals have to be aligned; otherwise you get cold spots at the entry and exit. The oven performs best when the load profile matches the lehr curve — if thickness or spacing varies a lot, you’ll need recipe adjustments. And plan on routine element inspection and cleaning. Dust and coating residues will quietly degrade heat transfer if you don’t stay on top of them.