Plus Flue & Installation* *Price excludes optional finishing items & fan. The Answer 2020 Inbuilt is a great size for small existing fireplaces. It’s size belies its incredible heating capacity. The Answer Inbuilt uses a five-sided convection chamber to distribute heat evenly throughout your home. Cool room air is naturally drawn around the hot firebox, heated, and returned back into the room without using a blower. The Answer’s .05 cubic metre firebox is larger than most other small inserts, so it offers longer burn times with less reloading. This model has a huge viewing area and sleek door design to make viewing and operating this insert easy and enjoyable.