Here’s what you’ll see from the outside when the bonnet is open. It might seem like overkill to take such care with a heater shell, but the dimensions need to be correct or the core won’t fit, the flap won’t move, the mounting legs won’t line up, or ALL of the above! When you send your heater to us for repair, you’ll never have to deal with ANY of that, and you’ll have a perfect unit when painted, which is actually a very prominent item when the bonnet is open!