Either I'm misreading something or there's conflicting information between the (broken link removed to http://www.blazeking.com/EN/PDF/brochures/Broch_Inserts.pdf) and the (broken link removed to http://www.blazeking.com/EN/PDF/manuals/OM-SC25-E.pdf). The brochure states the clearance required from top of door opening to mantle as 38", however the manual, on page 12, states that it's 20". Am I missing something? Is the brochure intending to state the clearance from the hearth to mantle? Either way it doesn't quite add up.