20�20 Diffusion Media Panel Filter600, Koch 136 2020 01 (24 pcs) voomi_id_10161 Model: S437A1025 H63A1X1 Model: S437A1025 ensuring your HVAC system operates at peak performance with minimal maintenance Maxi Grid 600L Diffusion Panel Paint Filtration Panels Progressive density media Durable steel internal support wire Individual panels or link panels for front access holding frames or side access housings Excellent filter for high moisture applications Size W 20xD 20 Maxi Grid A Complete Line of Internally Supported Panel filters Koch Filter offers six unique Maxi Grid Panel Filters for use as prefilters or final filters in commercial and industrial air filtration systems of all types universities