Compatibility: For H2D The honeycomb filter is covered with a layer of meltblown fabric to reinforce the density of the filter, which can filter out small particles and strongly adsorb volatile organic compounds. Reduce harmful volatile organic compounds (VOCs) smoke and odors generated during the 3D printing process, and purify air pollution through multi-layer filtration. Instruction:The Carbon comes with a carbon filter which is used for filtering the air from the enclosure before it is expelled outside. Here's how you can replace it:1. Remove the plastic cover 2. Gently pull on the carbon filter to remove it 3. Install the new carbon filter 4. Attach the plastic cover colour: Black material: Plastic + Activated Carbon Package Contents: 2 x Filter Element Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.