Features: Multi-layer Material: The Protective Box is composed of 3 layers including 900D oxford cloth, honeycomb and flame retardant cloth (with silicone coating), lightweight, high density and fireproof. Extended Smoke Pipe: The smoke exhaust pipe can shrink to 50cm at the shortest and stretch to 2m at the longest. It's convenient to pull the pipe to the open space for smoke exhaust. Large Space: FB2 protective box area up to 760x730x400mm/29.9x28.7x15.7in, large enough to compatible with 99% semiconductor laser engravers in the market. Smooth Air Inlet And Outlet Design: With enlarge air inlet, which greatly improve the efficiency of air circulation in the box and avoid low pressure effects. Open to Use: The box is foldable and easy to store, and portable to carry to the school, office, studio, etc. Any problem, please contact our store without hesitation. Honor to serve you. Specification: Model: FB2 Product Size: 740x760x420mm/29.1x29.9x16.5in Work Area: 760x730x400mm/29.9x28.7x15.7in Voltage: 100-240V (US/UK/EU/AU) Package Size: 798x555x120mm/31.4x21.8x4.7in Package Weight: 7kg/15.4lb Packing List: 1 x protective box 1 x Exhaust hose 1 x Metal mesh cover 1 x Exhaust fan 1 x DC12V power supply 4 x M4*50 screws&Nut combination 1 x throat Hoop 1 x Flange Fan 1 x H3 Allen Key 1 x Flat-blade Screwdriver