# Why is there a bevel in the lentil arch?

**URL:** <https://forums.firespeaking.com/t/why-is-there-a-bevel-in-the-lentil-arch/53>\
**Category:** Masonry Heater Construction\
**Created:** [January 21, 2022, 1:06am UTC](https://forums.firespeaking.com/t/why-is-there-a-bevel-in-the-lentil-arch/53 "2022-01-21T01:06:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dclaire](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.firespeaking.com/dclaire/32/194_2.png) [@dclaire](https://forums.firespeaking.com/u/dclaire)\
**Post date:** [January 21, 2022, 1:06am UTC](https://forums.firespeaking.com/t/why-is-there-a-bevel-in-the-lentil-arch/53/1 "2022-01-21T01:06:28Z")

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We are wondering if the bevel in the lentil arch goes to the inside of the stove or faces out?

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**Author:** ![max](https://yyz1.discourse-cdn.com/flex035/user_avatar/forums.firespeaking.com/max/32/5_2.png) [@max](https://forums.firespeaking.com/u/max)\
**Post date:** [January 21, 2022, 3:29pm UTC](https://forums.firespeaking.com/t/why-is-there-a-bevel-in-the-lentil-arch/53/2 "2022-01-21T15:29:20Z")

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It definitely goes to the inside of the firebox. The bevel is to help combustion gases smoothly find their way up the throat.

For context for others, @dclaire is in the process of following our plans for a 48”x32” masonry heater with 3-sided heated bench. It would be fun to see some pictures of your progress Claire!