Hi Mummychua, As my current flat is a corner unit hence i do not face the same problem as you. But for my mum's house, she installed iron grille for the living room & the rest alum grille for security purpose. If it fixed, you might faces cleaning problem later.. but normally i will wipe it only once a year before CNY... haha I choose white grille & so far i feel it easier to clean as compare to others. This is the old grilles, it had been used for 11 years & still looks ok... we changed it due to the gap size as we have young kids at home. This is the newly installed grille.