No. Because the fan in the Villa and Weekend runs continuously there will be no unpleasant odours in the room. Unlike other, inferior compost toilets which use narrower gauge vent pipes or poorly designed fans, the Villa and Weekend are 100% efficient at removing odours without the need for any sawdust or cover material. When installing the toilet, make sure that the venting pipe is properly sealed with silicone. The easily accessible fan filter should be cleaned regularly as well as the insect net at the end of ventilation pipe.