Hi. I managed to get some useful info from this forum. Spoken to Ricky from riben contractor. He is frank and friendly. The cost quoted to me is quite reasonable. So, I trust his word and try my luck to engage him 3 days later. Hope he deliver what he promise......looking forward to give fair comment after couple of months later. Cheers 29.apr 12 Installed the riben chute. May not be very thick material, but, should serve the purposes well. Hope it will help to seal the smell, smokes, cockroaches, ants, etc.....The installer reach on time and did good workmanship. I took his advice to place some pesticides stick around the bin at additional charge. Total cost less than $300.Now, I have to see how long it will last. Ha ha