How to slowly fade out a model?

local FadeModel_Out = function(ModelEntity, Speed)
   -- Put your supported Instance's that have Transparency property
    local SupportedTypes = {
     'Part';
    } 

    if ModelEntity:IsA("Model") then
        local Entities = ModelEntity:GetDescendants()
        for _,OBJ in next, Entities do
            for _,Type in next, SupportedTypes do
                if OBJ:IsA(Type) then
                spawn(function()
                  repeat
                    OBJ.Transparency = OBJ.Transparency + 0.1
                    wait(Speed)
                  until OBJ.Transparency == 1
                  end)
                end
            end
        end
    end
end

FadeModel_Out(workspace.Model, .01)
-- Arguement[1] Is your model directory path.
-- Arguement[2] Is your speed you want it to fade at.

I hope this helps your needs!