Design drawings are required for an indoor-outdoor combustion canister, primarily intended for burning paper. For indoor use, the product must suppress open flames and smoke. It should operate without producing smoke or noticeable odors in a 10-square-meter enclosed space, ensuring that paper burning does not cause any disturbance to neighbors. Lightweight: Total weight ≤ 15 jin (approx. 7.5 kg). Must be easy to carry up a slope with one hand. Fast Burning: Capable of completely burning 3 standard bags of paper ingots within 5 minutes. Safety: Surface temperature must remain < 60°C during/after use (prevent burns). Must include a detachable ash collection box for easy and convenient ash disposal. Durable & Cost-Effective: Target design lifespan of about 1 year (assuming max. 24 uses/year). Avoid overly expensive materials; focus on value for money. Efficiency Priority: The core design focus is maximizing combustion efficiency to handle large quantities of paper offerings in a short time. Heat Insulation: The high-temperature shell must have effective heat insulation. Easy Cleaning: Structure should allow for easy disassembly, cleaning, and maintenance. Modular Structure: Design should incorporate detachable/components. Two Versions: Outdoor Version: Can have visible flames and smoke. Indoor Version: Must suppress open flames and be smokeless during operation.