{"type":"rich","version":"1.0","title":" wrote","author_name":"npub1l9q6623y79nvrdv5qwwfprd5t3qgkecl3lmkck7hh8tv65x46vuskzcmqa","author_url":"https://yabu.me/npub1l9q6623y79nvrdv5qwwfprd5t3qgkecl3lmkck7hh8tv65x46vuskzcmqa","provider_name":"njump","provider_url":"https://yabu.me","html":"Paul’s 8” system in the Fischer Price house IS very nice! I spent two weeks at Wheaton Labs in 2019… both 6” and 8” work well. J-tubes are more efficient and (I think) easier to light than batch boxes.\n\nBelow 4-5” systems are MUCH finickier… too much laminar flow/resistance along the edges of the path of gas flow. 10” or larger gets TOO hot…"}