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Batch Rocket Masonry HeaterFull Build and Construction Considerations pt2

What design consideration for rocket masonry heater? Batchbox sizing, only length is flexible Batchbox material: walls proper firebrick and clayslip, ceiling vermiculite or other or refractory mold Secondary air pipe vertical part will eat away to certain point -- make changeable Port should have sharp (ie creating turbulence) edges Turbulence is needed for mixing of gases with air Round or square riser sizing -- round must fit square +30 cm above riser, more is better Riser needs proper insulation to create sufficient heat for full burn of gases -- no smoke from chimney is marker What material can withstand 1000°+ heat in riser without decay What design consideration for rocket masonry heater? (cont'd) Bell Heat is most extreme at outlet of riser (above & outward) An upside drum can be used as bell and rest masonry Chimney flue are is sizing guide for channels within Chimney bypass can be smaller if it doesn't close other channels to chimney Lowest part of bell for chimney outlet so stratification happens effectively Unlike J-rocket, secondary air is must in batchbox The larger the chimney flue, the bigger the bell -- do you want to create a monster? Everything scales upward as flue size increases Chimney sweep access into bell and flue What other design considerations? Local regulations vis-a-vié fire safety and building code Clearances around & above hot surfaces and door/ access points Chimney minimum height above roof level "The taller the stack, the more draught or draft is created", but not much heat evacuates from rocket stove... Prefab chimney vs self-built metal chimney vs masonry chimney What can you fix to what? Not eg different prefabs together Creosote & chimney fire (soot fire) resistance and T-class T600 vs T400, CE compliance in Europe (EN 1856-1) This European Standard specifies the performance requirements for single- and multi-wall system chimney products with rigid metallic liners Foundation under heater, can it stand the heat & weight? Chimney outlet should be straight patch without over 30° runs (draft issues will rise) Chimney pointers Make sure roof structure allows chimney outtake Access to chimney for sweeping (see my video on roof access ladder)