Looking for a reed diffuser box template for essential oils? We also adore them! They make your house smell fantastic, they’re secure, and they can offer the health advantages of essential oils.Placement of Diffusers: Three diffuser lengths is the maximum recommended distance between diffusers. For instance, the maximum separation distance would be 4 ft x 3 = 12 ft (1.219 m x 3 = 3.658 m) if the diffuser length was 4 feet (1.219 m).