Some of the links on this forum allow SMF, at no cost to you, to earn a small commission when you click through and make a purchase. Let me know if you have any questions about this.
Feldon's does include the area under the grate. Though placing your grate unusually high will skew the results.
I have not been around for a while, but there is an improved calculator used on this forum that I am not familiar with, so my take on it may not be up to date.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.