There is some rubber that lines the hole and this is easily made my extruding a box around the hole as shown. These simple extrusions should be no problem for you. As with everything else, put symmetry and meshsmooth modifiers on it.
Position a plane in the hole surrounded by the rubber. This plane will eventually be textured with a fine gauze pattern with a transparency map so that it looks like a wire mesh.
The grill is next. Create a narrow box and extrude it around the edge of the hole as shown. This box will be smoothed so chamfer the edges around it so that they get sharp.
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The rest of the grill is just boxes so start with a box and line it across as shown then duplicate it twice and position them as shown. Chamfer edges to get them sharp and add symmetry and meshsmooth modifiers.
